I've got a 3-ti-200 and been playing all day at 1024x768. 32 bit. Everything cranked to high, runs perfectly.
My recommendation though would be a GF4, anything besides the MX variety (which is a glorified GF3 it seems). the ti 4200, 4400, etc. Should last 2 years or so at least, and in the $150 - $200 range, depending what kind of deal you find.
For that, I like
www.pricewatch.com , and forums.anandtech.com - go and read the "hot deals" section, stuff pops up quite often there.
JAFO - just another $*$(%)_ opinion.
Sorry, been Lan-festing for about 24 hours straight now, and starting to lose it

hopefully that answer makes sense.
hoowie