I like to play a lot of systems, my favorites being D6 and Hero 5e. I don't get to use the Hero System as much as I would like, but I get my d6 fix when I run Star Wars. I like, and play, a lot of Pathfinder and Savage Worlds, too.
EDIT: I got a chance to play Warhammer Fantasy 2nd edition for the first time at Kantcon a few weeks ago, and I was really impressed with it. I picked up a copy of it off of ebay, and I'm looking forward to introducing it to my group.
-Chris