i am going to build and sell a gaming computer to a good friend of mine. the $400 build will have (AMD FX 6300, radeon r7 250 1gb gddr5, 4gb ddr3 1600mhz, 500w psu coming with case, windows 8.1) $500 build will have (intel core i5 3570, gtx 960 2gb gddr5, 4gb ddr3 1600mhz, 500w same psu, windows...