I would probably spend the spare £25 on getting a Phenom II X3 or X4.
If you have to have Nvidia, then change to a GTX260 (~£160), and get this motherboard so that you can SLI: http://www.ebuyer.com/product/173986 £80 but you would need a 750W PSU to have enough power to SLI two of them.
thanks, yer i've actualy got a 1000watt psu that i was going to put into another computer, but never did, and i've also got win 7 ultimate 64bit
so that free's up about £150ish, so other than getting the phenom cpu, anything you would suggest ?
Absolutely, get the 5850. The 5770 has no longetivity to it, it is a budget card, great for its price, but only for those on a real tight budget or don't game too much.
Worth looking at scan.co.uk too. They have a 750W Modular PSU which I am using and have had no issues with so far for £52 and I think the 5850 is a bit cheaper.