There were no cards in the GeForce 3 line built on a PCI interface - hell, there were only 3 cards in the Ge3 line, it was the shortest nvidia line ever i think - and any motherboard that does not have a AGP slot probebly would not really benefit from the power of a GF3Ti500.
Im afraid the leaves you with the FX5200 - which is (even compaired to the nearly 3 year old Ge3) slow.
With this upcoming generation of cards both major graphics card development companies are phasing out AGP - so i doubt there is any more PCI coming to the market any time soon.
Hope that helps
BTW - Welcome to Techspot :wave:
Steg