TWO i7 PROCESSORS..!!! Which motherboard..?? If you are thinking of using an LGA 1366 mobo built for XEON processors then give it another thought.. I don't think two i7's are possible as they won't scale together.. I've my reasons for this but if you've any article on it then please send me a link..
As he said. Two i7s aren't going to work well together. One CPU is more than enough, especially if you get a 980X or a 930.
Fastest cheap video card. How much is cheap? Below $100. Get ATi Radeon HD5670 or HD4770. $100-200. HD5770.