What about this one?:

Gamers Base Unit
Nvidia 8800. AMD Phenom™. (9600 Phenom, Quad Core, 2.3GHz
1 X Nvidia GForce EN8800GT 512MB Graphics
2 X 160GB Sata 2 Hard Drives (Raid 0 Configured)
1 X 2GB DDR 2 667 MHz
Vista Premium & Disc
Sony 18 X DVD Dual Layer Writer
Asus M3A - Motherboard

£625.33