Thanks.
1st poster: On usability: ya, neither are at all suitable for today's demanding games. But you overstate their limitations; I play EQ, World of Warcraft, and other games fine at decent resolutions (I play on a 21" CRT, so decent resolution is especially important) in the geforce3 ti200. Even games like Doom 3 scale down and play ok.
What I'm really trying to do is confirm whether I'll get enough benefit - say, 40%+ - to justify a quick and dirty $20 spend for now while I pick something else.
2nd poster: yes, and even 640x800 and 1024x768 generally work ok.
3rd poster: neat link; unfortunately there are no benchmarks listed. It's a bit hard to tell the difference in performance; do I look at the near-couble core CPU of the 5500, or the *higher* texture fill rate of the geforce ti200 over the 5500 (1400 vs 1080)? hard to get a feel for the overall difference.
On a related note, I wonder whether the cards' directx 8.0 vs 9.0 support makes much difference.