Do not buy an 8800! They are good cards but are outdated and for a little more you can get top of the line. I understand people often have fixed stances on either Nvidia or ATI and it would appear you like Nvidia, however, GET A 4870! Or wait for the 4870x2!
4870's are available from £160.
Also what RAM and CPU do you have, i can give advice there to if you need.
