Well, since the last time I posted in this thread, the regular cat5 cable fried, so I'm wire-less on that computer again. I expect that I'm going to get a regular internal (PCI? I dunno, whatever the kind of slot I installed my video card in is called) wireless card when it's time.
Yep, it's a PCI card, and you should be able to find one for $20 or less.