Intel Q6600
Asus P5N32-E SLI PLU -
Probably better to go with an Abit IP-35 (possible an IP-35E) SLi won't be worth it
Coolermaster Real Power 520W -
As Lucio says, the Corsair 520W HX is an excellent PSU with a near silent fan and a 5 year warranty (back to scan assuming you buy it from it them )
512MB XFX 8800GT Alpha Dog
Geil 2Gb 6400c4 (4-4-4-12)
Samsung SH-S203D/BEBN
Arctic Cooling Freezer 7 Pro
160 Gb Western Digital 16mb cache sata II -
I would make this a bit bigger to, 320GB is about £15 more
Coolermaster CM-690 -
not a bad case, you might want to check out the antec 900 though, similar money and a its got a great reputation