Get a Gigabyte DS3 instead of that intel, a e6600 instead of e6400 and also switch the 1950xtx for a x1900xt or a 7900 gto/7950gt. Get 2gb of corsair ddr2 800 ram with some 4-4-4-12 timings. DOnt get the ram heatsinks or motherboard cooler. Get a zalman vf900 for video card instead. Everything else is ok IMO.
EDIT-For nvidia go for evga, for ati go for sapphire. Also I reccomend the DS3 because of the reviews, its features, and because it is being recommended to me for my new build
i3 540 @ 3066 MHZ
4GB DDR3 1600 1T 9-9-9-28
HD 5750 @ 850/2400
Antec Lanboy Air