Well this all got rendered moot. I'm down to a single player due to schedule/interest conflicts. x.x Thanks for the help anyway though, guys!

I was planning it to be a relatively short-term thing for the first run, luckily, that might lead into some -serious- trouble later. You know, this is the first big problem that sets off a chain reaction type thing (Opens said mafia type's eyes to magic, brings some other bad stuff into town that's slinking around, trying to get little scraps of leftover power, and who KNOWS what an idiot warlock who's no idea what he/she's doing could let loose that might sit around like an undetected land mine...)

So far my PCs are considering a cop as you stated (Clued in), a do-gooder, a werewolf who's romantically attached to said do-gooder, and possibly a dresden-style PI. Among other ideas.

As for "assassination target with fairy friends," I was actually considering a relatively low level vampire target getting whacked and stirring up -that- hornet's nest.

Thanks for the advice, both of you. 
I'm reading those campaigns as soon as I get home. (yes, I am on a phone too.)
One thing that did occur might be starting on the middle of something relatively simple and building up from that... Mostly to get a feel for things. The only bit that worries me is that this isn't always the most take-charge group. (yay gm jitters.)