If price were no obstacle, and you could succesful get this many stars to work together, I have put together my ideal Dresden Cast. Some of the ages are a bit off, and some of the characters could fit the look better, but I have taken much consideration on acting talent as well based off similar roles.
There have been some good names I glanced over and many of them could be runner-ups IMO but I also considered relations for my cast. For example, Thomas and Harry need to look like they are related, and Lord Raith would have to look like he could be Thomas' father. Inari and Lara should look like they could be sisters and related to Thomas as well, etc.
Some other good actors that I like (for this kind of movie, most have played fantasy roles):
Kristen Bell, Benecio del Toro, Christopher Waltz, Eric Bana, James Marsters, Liev Schreiber, Kevin Durand, Hugo Weaving, Ian McKellan, Geoffrey Rush, Patrick Stewart, Ewan McGregor, Ralph Fiennes, Willem Dafoe, Liam Neeson, Joaquin Phoenix, Michael Sheen, Russell Crowe, Jude Law, Jeremy Irons, John Malkovich,James McAvoy, etc.
I am sure I could go on forever with good actors that I like, but I also considered the chemistry of the actors. For example someone really famous like Brad Pitt, Keanu Reeves, Johnny Depp, probably wouldn't go over well as a cameo part, albeit I have casted some big hitters for small roles in my fantasy cast, but I was trying to squeeze in my favorites.
Without further adieu my Dresden Cast (pdf):
Male RolesFemale Roles