Hmmm, I think I had the same problem with my mouse (KB is PS/2.) Turning off Legacy USB support is what fixed it for me.
And the card I threw in is just a PCI card
The board has a couple of open regular PCI ones, in addition to the PCI-e x16 and the x1 (which I've heard FreeBSD has limited support for anyways.)
Thanks for the reply, I'm going to have to give the age0 driver a try now