I was wondering what the best card was.....
all i could find was the Radeon 9250 256MB
Hmm, a normal AGP 8X card "should" be backwards compatible with AGP 4X/2X. Some may not, but I had a 9600XT card, and it was AGP 4X compatible.
A card labelled AGP 4x/8x will work in an AGP 4x slot. So you can probably even get a 7800GS AGP and it would work in the slot. If u buy a powerful card like a 6800 or an X800 series card, make sure u have a powerful enough PSU to handle the card. Good luck.