A video card now is nothing if the motherboard doesn't support it. e-VGA is all the rage now, so if your motherboard does not have e-VGA video card slots, you won't get very far.

As far as a video card goes, check newegg.com and look for a card that is anywhere from 100 to 200 dollars, and has good reviews. Only power junkies who care about squeezing every last inch of framerate into their card would go into further detail. The best choice is one based on self-research.