well, i bought a generic usb card off of ebay and it worked quite well (it was for my 7200). It only needed apple's usb drivers to work. Only had problems when i upgraded to OS9.1 and couldn't hotsync anymore---my wacom tablet still worked though.
then i got a tiBook, so i didn't care anymore...
I figure they all probably work about the same, so just shop for a good deal.