Yeah, but do note that if you were to get a PCI-E card later on when the 9800PRO doesn't perform anymore in games as well, you'd have to change your whole motherboard.
Why don't you go for a PCI-E board, and search for a bridge chip, I think their called.
It allows you to use AGP cards on PCI-E motherboards, and just slots in to my knowledge ready for use.