Is all about the Benchmarks
Those are the Updated AGP graphics card benchmarks. If you scroll down you will see how these cards performed in the various tests (i.e 3D Mark 2005, Unreal Tournament 2004, etc.) From those tests you can get a good idea which card performs better. Hint: Its the ATI Radeon 9800 by alot.
For even more performance I would go for the ATI Radeon 9800 PRO. With that card you can pretty much play any game out there now decently. You can get a good for under $130 at Newegg.com.
Im trying to buy a graphics card for my agp slot, but I cant decide, ive heard of ati 9800 and nvidia 5900 but can some give me like a list of the best for the above mentioned agp slot????