looks good, i just bought a similar set up (different brands same idea), but I recycled my gtx 460. I'm an nvidia fan as every single ati card i've ever had has gone out on me, and i'm sure there are plenty of people that have had the exact opposite situation as me where their nvid cards are crap. you could overclock a 6850 instead of the 6870 and have similar performance.
i personally prefer antec psu's to corsair, you may consider looking at the antec ea650w. either way, i have corsair products too, so i think you've got a good set up. should be around the same cost (not listed on your screen though). I imagine you intend to overclock the 2500k?
Either way, have fun with your new toys.