Bruuuuuuce!
I do like the idea of a multi-roomed or multi-leveled place with different music in each. I'd venture that would be (for Players Ball or something else) the ultimate "make everybody happy" webmaster event!
I've been to a few clubs like that in the past (not at conventions) and those are great. You can pick the area with the music that best suits you, or spend your time bopping from one section to another.
... Just two more cents to pitch into the kitty.