Which video card to buy?

Well, the ti4200 is like.. 15-20% less powerful than the ti4600. And the 9700 Pro clocks the ti4600 in everything, like 1.5x faster.

about 50% as good then, good enough for me for 1/4 the price. id just like to play some games (AA) with higher resolution and framerates.

think id be able to run it at 1600x1200 with halfway decent FPS (30+) on a ti4200?

Processor? Ram?

athlon 1400 mhz and 512 ddr

Probably.

awesome
cuz right now at 1024x768 with my gf2 somethin or other i get not too great fps (like 20ish with nades bursting and constant shots)

I would recommend to keep your resolution below max (maybe 1280x1024?)