if you dont have money, then its OK to go, else nVidia didnt showed so called PERFORMANCE Architectural desing in FX series, GeForce 4 was better than FX (earlier versions), and now 6800 series is rock solid.
as 5700 chip came at very last, so it must have some good features than olders (5200, 5600, 5800), which I am sure had made it worthful to buuy.
if u r getting that, better buy from a reliable manufacturer (Asus. MSI)
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"