Ok, if it is AGP, which I and Charchris presume it is, then do the follow two things for $150 or less. However, the best option is the last one, but it is $213, a great price for such a powerful card!
ATi- Take your pick from the thousands of ATi Radeon 9600XTs and Pros on newegg.com
BEST OPTION, but it costs $63 more, but pwns all the choices above really bad!
That is the best choice, nothing under 230 can beat that card, NOTHING!