Brand new Geforce4 Ti4200 128mb £59.75
http://www.ebuyer.com/customer/produ...duct_uid=35480
Radeon 9600 128mb £52.88
http://www.aria.co.uk/ProductInfoComm.asp?ID=10140
Both within the suggested price range (no £80+ cards)
I'd go for the 9600 if it really is a proper 9600 and not an SE, I'm sure some of the experts can guide you on that point.