OcUK GeForce 7600 GT 256MB GDDR3 TV-Out/DVI (PCI-Express) - Retail
500MHz Core, 256MB 1400MHz GDDR3 Memory, 12 Pixel Pipelines, SLi Ready, 1yr Warranty. £58.74
Gigabyte GeForce 8600 GT Silent Zalman 256MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail (GV-NX86T256H-ZL)
570MHz Core, 256MB 1400MHz GDDR3 Memory, 32 Stream Processors, SLi Ready, Fanless Cooling Solution, Supplied with Never Winter Nights 2 PC Game, 2yr Warranty with OcUK/Gigabyte. £86.94
from what i can make of it.. i would say the 8600GT is the better option. Compare to see the technical differences and other then that its dx10. Theres not much else you can tell.