Hello, I got my hands on two more of these machines. Two of the don't have airport cards in them. I can install them, but was curious, has Apple put out different models of these cards over the years? If so, what it the latest that will run on these machines? I found this, Apple AirPort 630-2883/C 11Mbps 802.11b Wireless LAN Card, on ebay...is this the latest one that will work? Thanks again!