Looks solid from here, the Intel® Core™ I5 2500 should do very well for you in gaming and the P67 looks like it will do the job nicely. I personally like a more ram, I would go with 2 x 4GB of DDR3 1600. Also the I understandably favor the Intel SSDs, but I don’t see any problems or issues.
That Corsair 650W unit would have been enough for that machine, people always over-estimate power draw. You could unlock the extra shaders, overclock them to or near 6970 speeds, and still be all right. Even so the 850W gives you a little more room to perhaps add a third card or if you use something more power hungry down the line.