Welcome to c3d:, Bluestake. We promise not to bark or bite, though we may poke on occasion...
Nice build so far, though I don't see why you went after a top-notch psu and mobo then dropped to an e6400 cpu instead of going with the e6600. But to each their own, and my 2-cents on gpu would be the nVidia 8800GTS 640mb. Don't bother with the expensive super-over-blown-out-of-the-box versions, just a nice stock and then oc (they all do well from what I've seen on the web...).
If you're looking for an HSF, and have a few extra dollars, the thermoelectric coolers by Vigor (Monsoon II) Titan (Amanda) are pretty darn good. My Vigor was outstanding until I hooked it up to my EVGA mobo, think I hosed it. On my AW9D it was nothing short of spectacular, e6600 oc'ed to 3.7GHz stable was well above expectations (ran 3.6 daily). Prices start at about $100.
watcha matey :wavey: no such thing as a stupid question, as if the person asking the question knew the answer it would not have been asked, unless the person was stupid, and you are obviously not as you made it this far