ComputerBB

Gamer:
CPU:
Penium 4 3.4ghz EE
Motherboard:
Abit AI7(Intel)
Graphics Card:
Nvidia 6800 Ultra
ATI Radeon x800
RAM:
4x Corsair XMS 512mb PC3200
HD:
Westurn Digital 70gb 10,000RPM Serial ATA
Westurn Digital 120gb 7200 RPM Serial ATA
CD-RW:
Lite-On 52*12-52 CD-RW
Heatsink:
Spire Coolwave 4200 RPM (Intel)

You should add the Athlon 64 3800+ and FX-53 (as they are the fastest out for gaming) as an alternative to the P4 3.4 EE and they are cheaper.

Benchmarks moreless prove that AMD plays games better anyway