I recommend getting a quality power supply like a Corsair 650tx to go with the single 4850 or 4870 veedubfreak mentioned. I have never heard of IBP and they aren't listed in the Power supply guide which usually isn't a good sign.
this is the link to their site
iBUYPOWER: Custom Build Gaming Computers Desktop PCs, Notebooks
so what do you guys think about the Killer K1 - Online Gaming Accelerator - w/ 333Mhz Network Processing Unit + Lag & Latency Reduction Technology
does it actually make a difference?
Thanks!