Why dont you go buy the 920 and save 400 dollars?
Yeah, thats better, then mildly OC it to 3.3GHZ, and bam, you have a less that half of the price i7 975. And if your paying so much for it, why not just get a new PSU? Corsair HX 620, 650 or 750 will do fine, if you dont want modular, get the TX line...
EDIT- Get the ATI 4890, way better value than the GTX 285, or wait for the new 58XX series.