Hmmm the motherboard that supports both would have been nice to know a few months ago when I built this sucker

At this point though, I'm stuck at deciding whether to buy a good AGP card or just buy a PCI Express card and a PCI Express capable motherboard. I have the money, I'm just a tightwad (i.e. student) and I have qualms about spending that amount of money without a lot of forethought. For now, though, the Anti Aliasing suggestions may temporarily solve my problem. How do I change them or see what they are? Is it on my vid card software, or within the game?