GT wrote:

" Are they be in a different league, or would I not really notice a
difference? "


Forget 256MB cards; You'll be paying more for a card that has slower
RAM. 128MB equivalents will cost you less, and have faster RAM chips.

You can have this from me for £40 (including recorded delivery):

*** MSI GEFORCE FX5700-TD128 (128MB AGP8x) ***

Original box, complete with...
- DVI-to-VGA adapter
- TV-out lead
- Manual

Software bundle includes...
- MSI Multimedia Beyond 3D
- MSI 3D Desktop
- MSI Media Center Deluxe II
- VirtualDrive Professional
- RestoreIT! Professional
- InterVideo WinDVD 5.1 channel
- Supreme Foreign Language Learning Machine

Games bundle includes...
- Duke Nukem: Manhattan Project
- Tom Clancy's Ghost Recon
- The Elder Scrolls III: Morrowind
- Games Collection: 7-in-1 (Demos)

The fan shows no sign of wearing / giving-up.

Product on MSI website. http://tinyurl.com/bbbtu
Comparison of FX5700 128MB and other cards. http://tinyurl.com/69nj3