Quake3 is pretty much a joke now as far as benchmarking is concerned. I won't be too concerned if the R300 loses to the GF4 in this while coming out on top in more demanding tests. UT2003 is one such example.
The radeon 8500 is soundly beaten by GF4 in high quality UT2003 but that's not likely with R300. All the hints (from anand, and others) point to a real sweet performer. A good indication of future performance, not in 3 year old games. Unreal2 is coming soon and should also benefit from r300.
Btw, my name implies that I'm nVidia user. True, true, I've lurked at Beyond3d ever since the demise of 3dfxgamers (I posted as NV20 there), and at 3DGPU for a while (hi John!
). I'm also still using the NV20: aka Geforce3.
I never upgraded to GF4, thought I'd wait for the NV30, but the R300 is looking good right now, albeit based upon rumor and hearsay. Drivers have put me off ATi solutions in the past though that may change now, they seem to have got their act together. It would be nice to try a different brand too, I hate fanboy logic that says you have to be loyal to any given company.
Anyway, r300 is probably my next card. Only driver problems or lousy performance in current games, especially with aniso + fsaa, would make me reconsider.
edit: hehe, "fan-boy" isn't allowed? It was filtered from my post. I guess the word is overused and hated in equal measure