I have an older 17" G5 iMac (specs below) that I want network access to. I bought this computer 4 years ago without a card and was wondering which model of AirPort card am I suppose to install. Does it even have a slot for a card? I've been researching the USB adapters but hear very limited success with those. Most say they cut out and become tedious. I would like something more reliable. I hear the way to go is a AirPort card. Can someone help please?