Animal
I have the Radeon 8500 OEM on my system. I run it at 1600x1200x32, fps drops to 20ish in heavy smoke w/lots of planes around..up to 55ish when there's nothing to see.
Be advised, the OEM card is clocked (core/memory) at 250mgz as opposed to the retail 275mgz. You can get a program called "Power Strip" that will let you overclock the card to appropriate specs (Win98/ME don't know about XP). I haven't overclocked mine since I put my new system together...will probably get around to it one day lol.
Picture quality is far better than any other card I've ever had...(Some old SiS 3D card, VodooII, Banshee, VoodooIII 3000, Geforce 256). Speed however is not quite what you'd expect but the fps doesn't vary during the game nearly as much as the Geforce..just seems more stable.
Advice? If you want a very pretty picture...go with the Radeon. IF you want speed, stick with what you have (I'll assume you have a GeForceII Ultra, can't comment otherwise). Personally, I probably would have waited on this new Nforce thing had I known about the OEM underclocking issue ATI didn't bother to tell anyone about until after they put it on the market.
I'm fairly happy with the card, but not the company.
Good luck
Tumor