I have an nvidia TNT2 64bit 32meg APG card which is a nice card that I have and its FAST! and works most of the timebut its not that cheap so if you want a different one maybe a vodoo2 or 3 or a S4 Savage 3(though the savage isnt too good for games) The G-Force 2 is what im going to get and is the best out there and it comes with a GPU which is a graphics processing unit sort of like a CPU but just for graphics and lighting data which means it is the fastest out there. I played unreal tornament with it and it ran very nice. So dont go with the cheapest one because with computer sadly Ive found the cheaper the crappier. If your not into games then go for the savage. Hope this helped and sorry if this post is a little too long
-JTM