Let me see, I have:
Mark -- He's dedicated to the game, and while not a theatrical roleplayer, he does think through how his character would react to things.
Louis -- Again, dedicated to the game. He definitely makes attempts to roleplay, including adopting a "voice" sometimes. He approaches the rules as a puzzle, and he min-maxes quite a bit, but he doesn't push it to the limit. His power-gaming is interesting, in that it's always about defense or teamwork, never about raw damage.
Mike -- Fairly dedicated to the game, but misses maybe one in six or seven sessions. Easiest-going person I've ever gamed with, and fun to hang around. Good roleplayer, in the narrow niche in which I've seen him.
Chris -- Dedicated to the game, but has lately been getting hijacked by Tanya. Power-gamer tendencies, but not bad. He drives the game when it comes to interacting with NPCs. A little bit of a tendency for the "mysterious loner."
Tanya -- Chris' girlfriend. Misses quite a few sessions, and sometimes drags Chris along. She likes to roll lots of attack and damage dice.
So not perfect, but a pretty good group.