I need help picking a new computer

I want to get something that is good for gaming. Not crazy. I like to play Star Trek Voyager Elite Force, Civilization, Star Trek Legacy, Want to play Crysis, Spoor, Second Life.

I want something for just a regular guy in the valley who wants to play some games.

please give suggestions.

I have already looked at

Velocity Micro (looks COOL!)
HP Gaming machines
Alienware