Replace the cpu cooler with a thermalright ultra extreme (+120mm fan) or a tuniq tower
For the graphics, there are new cards out next month, but if I was to buy now it'd be an 8800GTX, that'd be better than the crossfire arrangement you have listed.
A corsair HX620 modular psu would be enough for your needs, and it costs less, as well as being very highly recommended by a lot of people.
I'd also have a good think about whether DDR3 RAM is worth it, most people would say it wasn't at present.