Longest PCI-X Card Available for my PowerMac G5?

Im looking to save a little money, but still get a footlong card (or the max length card) made for the G5 with PCI-X, or AGP or PCI, if compatible. It can be any card, from USB ports to Graphics. I have the original 2003 dual 1.8, if that helps. It has the 160gb hdd, but 5.5gb of ram. Let me know ASAP. Thanks!