lol I tried to switch my friend's pci Radeon 9250 with my Radeon 9200 AGP. I figured I'd rather have a pci card I could use in case I ran into a no vid card between a few systems that have agp or pci-e. Alas, crappy compaq didn't want to use the pci card...
But ya, get pci-e... it's foolish to get AGP right now... When agp users are fighting for an agp version of cards that tend to be $50 more, there's no reason to spend a few bucks less for an old motherboard with and old chipset and so forth.