Help With Choosing a graphics Card

[MilitantB0B]

I am going to make my own computer (it will probably be ready just about time for PS hehehe ) so far here is the rundown:
1.53- Athalon xp 1800
512 mb

The rest of it is unimportant by video game standards except for one big thing that is missing, a video card. I was wondering what kind of card you guys would suggest for the computer maker on a very tight budget (so please, don't make me any sadder by telling me that this game won't run good unless I plunk down big money to buy a 9700 or something ) Thanks in advance to your replies.