I'd not build that as a gaming rig tbh,
you may be better off with an overclocked amd955 build at this price, the real Intel gamechip right now is the 2500, 2500k if you overclock, but thats not in budget even just for the chip
you will be able to play games on the 2100, but I wouldn't expect massive fps and smooth gameplay at high settings, it just wont happen
Moto