Well, if you're into fighters, Marvel vs. Capcom 2 is awesome, as are both Guilty Gear X games. For music games (that dont require any extra controller) you could go with Frequency, then its sequal Amplitude, both solid, plus Rez, but that goes without saying. For action RPG's/dungeon crawlers, you should go with the first Baulders (sp?) Gate game, and both Champions games (..of Norrath, and .. Return to Arms)