Loose the quad and go with a good dualcore within the same price range look at the E84, 85 or 86 being the most expensive. I highly recommend getting an aftermarket cooler it will keep that quad or a dualcore nice and cool and if at some point and "he" decides to overclock he'll be able to.
Loose the nVidia chipset and get an Intel chipset find something in the same price range look at the Asus P5Q series or Gigabyte whichever best suit your needs.
2 X 8800GT's huh I think for about the same price you probably get a single 4870, adding a second later for crossfire is always option. Even with the dual 8800GT he won't be gaming at 1920x1080 I can atest to that.
8 gigs of ram? A little overkill 4gig is more than enough I highly suggest the Mushkin Ascents 2x2gigs PC8500 its also leaves alittle room
Exactly what he said.. an E8400 with an Asus P5Q Pro (if you're on a budget, you could look at the P5Q-E and P5Q Deluxe too) would be faithful enough for you.
Accompanied with a 4870 card will make a good pc for you.
4GB is more than enough, 8GB is really overkill. If your looking to overclock, get the Mushkin Ascents instead, those are really good, might be a little pricey depending on budget but I look at it as the best bang for the buck for overclockers memory..
That Power Supply is one of the best 750w PSU's out there. I'm guessing you meant you have the power supply, hard drives and case in possession. Which case is it if I may ask? :P