I should be going for 256mb, but i cant drop that much on a PC before Uni. Found the 6600GT for only £150 at ebuyer:
http://www.ebuyer.com/customer/produ...duct_uid=81344
And the 6800 for £170 at lowestonweb.com:
http://www.lowestonweb.com/Products/...3-8A8D0253C1B2
Not sure which is the better bang for buck