Building gaming rig need help!!!?

Yes, everything you listed is compatible. But why are you going with previous generation Core i5? Intel released socket 1155 (Sandy Bridge) this year, and it replaced socket 1156 altogether. Ditch the i5 760, and go with the i5 2500K. It's the same price. Newer, faster, highly overclockable, and runs cooler. Requires a socket 1155 / P67 board. Keep everything in that build, just swap the processor and board out for a socket 1155 CPU and motherboard. A socket 1155 / P67 board from ASUS or Gigabyte. As far as which HD 6850 to get, go with the XFX HD 6850. You get a lifetime warranty with XFX. For a power supply, stick to Corsair. Yes, the Corsair HX650w is more than plentiful for that build. Good brand and unit.