Don't get the 2.2ghz computer, get an alien ware area 51, they are coming with 2.53ghz now
The best gaming machines money can buy:
www.alienware.com
You can even customize it, here is the price I came up with if I added the best equip you can get: $13,390.00
Here is the Area51:
Dragon Full-Tower Case (340-Watt PS) (Space Black)
Intel