
Well a Rad8500 is a better choice than a GF3 card, but Aniso is much higher quality and AA is MUCH better on GF3/GF4TI cards. T^he Rad8500 cards tend to be a smidge faster and sport much better image quality, DVD playback, TVout and dual display making them a wiser purchase than a GF3, if you can live without the fastest AA and higher quality Aniso that is. At 1ghz there is little point going for a GF4TI unless you will be upgrading soon, so the choice really does come down to Rad8500/LE or one of the GF3 cards. It is VERY much worth buying 128MB on any new gfx card, 64MB will hit you very hard with games due out and there is already a sizable difference in some of the recent games already out. You'll really regret saving that $20 for a 64MB card, unlike many things in modern computing 128MB gfx cards are not marketing.

EDIT: Actually in your case I would rec a 128MB GF3 card, since you will be pretty CPU limited you will want to run with AA and Aniso on to use up the untapped gfx card power, this would be much better on a GF3 card, BUT do rem you are sacrificing image quality, DVD playback, TVout and dual display. See what the prices are like, and weigh up your reqs and personal prefs, both Rad8500 and GF3 will make you very happy.