If you're still aiming for a top-end card though, the suggestion of the 9800 gtx still stands.
Why though?
Its a £200+ card which, at the resolutions 1280x1024, will offer incredibly little/if anything over a 8800GT which can be had for around £120 now.
The 8800GTS can also be had for £165 and thats the same card as a 9800GTX except the 9800GTX has been overclocked a little.
9800GTX @ £200ish = poor vlaue.