Here's my build:
Gigabyte X58 motherboard - this motherboard supports your CPU, up to 24GB of RAM at up to 2200MHz, and dual graphics cards at x16. $199.99
G.SKILL Ripjaws 3x2GB 2000MHz Kit - this RAM is very fast and 6GB is enough for quite some time. $174.99
XFX HD 5870 - ATI's fastest single core GPU. Get two of these - it'll be amazing in any game at maximum settings and very high resolutions. $379.99 x 2 = $759.98
Western Digital Caviar Blue 1TB - fast, high capacity drive. You could get a Samsung for the same price but I've always had Western Digitals and nothing's ever gone wrong with any of them. $74.99
LG 22x DVD Burner - there's really no need to spend any more on your DVD drive as this one burns all types of DVD at high speeds. $19.99
Coolermaster GX Series 750W PSU - reliable PSU with enough power for your system. $79.99
Coolermaster HAF 922 Case - personally, I prefer this to Antec's offerings, I think it looks great, and it has excellent cooling with its 200mm fans. $89.98
That's it. You've got an amazing build there, with high speed everything and super fast CrossfireX graphics cards. The price: $1399.91. Man, you just need to spend $8c more and you've got a perfect price point