Go for a am3 build. Socket 775 will die in ~1 year, and am3 is still the latest amd board.
Get some triple-core amd cpu and 4gb ddr3 ram.
tri-core AMD's give much more cpu power for the cash.
You wont need that 4th core however.
4Gb ram is also enough. Just get 4gb ddr3-1600.
Dont spend that much on a cpu cooler, seriously!
Get a Corsair HX50 for ~$50. Dont spend more on a cpu cooler!
That gpu and psu are really smart choises, gj
Don't get that 6gb/s hdd right now. They are waay overrated. Just get a F3 samsung spinpoint, they are way more cost efficient.