Frankly, you're doing the smart thing. Been there, done that. I'd go for the Radeon, if it absolutely has to be between those two. But don't rely on my opinion too much, it's just based on a Google result:http://icrontic.com/forum/showthread.php?t=43899
You should listen to NovaThunder IMO. Never mind that his link points to a PCI-E version, with a little luck you'll find an AGP version too somewhere.