It's called Gordon Bierch (possibly flipped the i and e) and it is literally across the hall from the first floor of the Barnes and Noble (if you walk out of the Barnes and Noble and walk in a straight line you run into the wall for the GB). 

I am also from the area and spend entirely too much time at that mall.  There's a really nice open meeting area just outside the B&N on the first floor between the Gordon Biersch, Coastal Flats, and another restaurant that just opened who's name escapes me at this moment.  The TGI Friday's is in the same area as the theater on the 3rd floor about 5 minutes walk from the B&N and is also next to a large open meeting area (although it tends to be filled with kids and their parents as there is a play area nearby) and one of the large food courts in the mall.  Both of those would be easy places to meet up and I am fairly sure that they wouldn't mind having us hang out and game for a bit as long as we are also buying food etc. (obviously calling to ask is a good idea).  After the signing, as has been mentioned, there are a large number of very good restaurants in the area (15 minute drive or less) including several in "Tysons II" which is a different mall just across the road. 

Short version, there's a lot of options, once a head count exists someone (it would appear to be SkinsFan since I'm not about to fight him\her for it) can call around and see which of the many places would be willing to work with us to hang out before and\or after the signing.  But the head count is probably the most important part.

3) What I'm asking is - does the ability make sense?
Does it really make sense that there are entities out there - who are not true heavyweights by any means - that can take the entire nuclear arsenal of the world to the face and not just survive but entirely laugh it off?
Does it really make sense that if the entire White Council worked together on the most potent Heart Exploding spell in existence, spend weeks and weeks sacrificing humans and going full crazy-on black magic to get into the 4 or 5-digit range as far as shifts go, creating a spell powerful enough to wipe a country off the map, a freaking Ogre(not a heavyweight by any means) could just shrug it off?

To answer the two "Does it make sense?" questions.  Yes, it does.  Compare it this way, if you are made of fire, does it make sense for you to be able to withstand a similarly powered column of fire?  same answer.  You may not like the existence of those creatures, but it does make sense.

The next question to ask is:  Does it make them more powerful against those things as well?  Yes it does.  If you are immune to magic and all that the wizards have is fireballs to throw at you, you should win.  Just as a creature of fire should handily beat someone only armed with a flamethrower.

If that's true then you need to ask the last question: Does it break the game?  I remain unconvinced.

Combat does not have to simply be direct fireballs and physical attacks.  There is much much more to it, and physical immunity only prevents that direct confrontation, it does nothing to stop every other method of interaction available to the players.  Social combat, Mental attacks, physical aspects that are tagged, and invoked.  Throughout mythology there are plenty of creatures that are just flat out immune to X, why shouldn't they be modeled that way in the game?

Physical immunity is a very specific very powerful ability.  As a GM you should limit its use, but that doesn't make it a bad power.  Shapeshifting, Glamors, even Thaumaturgy all have the potential to be game breaking when used and thought of in very specific ways, why shouldn't physical immunity?  It exists to model those few creatures that are really and truly untouchable, and for those creatures I think it should be there.  It is ok to force the players to panic, its ok to put them up against something that requires lots of creative thinking, and maybe even forces them to run away the first time.

While a GM should try everything they can to answer "yes but" there are times when "no" is the right answer.  "Can I beat him into a pulp?"  "No, but you could trap him in iron chains" is just as good an answer.

*Edit:  And Belial just barely beats me to the punch with exactly the same thoughts.

Ah power gamers.

Look, DFRPG is a story heavy, rules light system.  If you want to break it, you can do that.  You can do it really easily (at least if you do so directly).  However, it also encourages lots of lateral thinking in order to get around those types of problems.

Consider this example:  We have a normal human in every way except he\she\it has physical immunity with a +0 catch.  You aren't going to hurt this person, ever.  Fine, instead of trying to kill this person directly (impossible) I'm going to spend the next set of exchanges applying aspects such as "Pinned Down" "Wrapped in barbed wire" "trapped in dirt".  I could also use assessments and declarations to apply "Weak floorboards, "creepy house" or "Construction yard relics".  After applying 4-5 aspects as a team we then tag them for effect in rapid succession.  We use those tags to force the NPC to concede, to be trapped in wires, to be pinned to the ground or some other equally effective way to simply prevent this person from moving.

DFRPG is all about aspect manipulation, story and creativity, not numbers.  If you just play by the numbers you are going to have easily broken systems and miss out on half the fun of the game.

I will absolutely be there, and I would be perfectly happy to meet-up before or after.  I would strongly suggest eating at one of the restaurants in the mall itself rather than trying to find a place nearby and hoping you get back in time.  As has been mentioned, traffic in the area of the mall is really bad between 3 and 7 (sometimes its ok, but I always triple the amount of time it takes to get there when going to the mall around then).

I should also note that you need to give yourself a huge window of time if you are planning on driving into the area from somewhere else.  Traffic is generally hellish for the entire area, and so while it might take you 20 minutes to get from the 95/495 interchange to the mall, it could also take you two hours.

I don't think the toughness power needs any more refund at this point. If he is fighting evil, he goes all angel and got his powers, if he isn't, he is Joe Normal and can be hurt like anyone else. All his powers already have the +2 refund from the involuntary change, anything more would be, like Tsunami said, wringing some more points out of it.

This way, as long as he is in his angel state, he is protected against a lot of harm, even if it comes from a mundane human source. If he would, for example, slay someone who already surrendered, he would loose all his abilities until he would be able to redeem himself in some way. This would make him pretty similar to the swords of the cross, enormous power as long as they are wielded for the right purpose, fragile, if they are betraying this purpose. And in my opinion, a being like this should probably work like this.

Again, what if the evil in question was a mortal?  The idea is to have an angel that protects against the supernatural and fights evil, but is bound by the will of the mortals.  Your version doesn't deal with this concern very well.

Actually this supports the whole hood prevention but in a weird roundabout way. The caster has no thematic link to anything at that point. I would think that actually having the target nearby would count, but with the hood....

Mostly though I'm with Sanctaphrax and Wookinstien on this one. They don't get death curses unless they are interesting to the story like "Die alone!" Otherwise it's just bad form to tell the PC's "You've taken him out, he explodes and you all die (or are severely injured or messed up in some way)."

First of all, I would think that the wizard in question could always link to him or herself.  (for example, call down lightening on him or herself, or turn into a burst of flames, or whatever devastating explosion they felt like).  I think the two biggest protections that Wardens have is their experience and encasing the entire event inside a circle.  The circle limits the power a Wizard has access to and limits potential targets to just the wardens in place, and the experience and power of the wizards present probably allows them to defend themselves from any potential attacks.

In game terms, I would say, as pretty much everyone else NPC wizards do get a death curse, but I would treat it as the opportunity for plot hooks rather than the ability for the taken out wizard to deal massive damage to the party.  Figuring out what curse is now hanging over their head, dealing with the demon called up at the last minute, or coming to terms with a new aspect applied to one or more characters are all sparks for good storylines, and are probably the best use of the death curse.