I guess I'm getting a little more serious about this now. Brendon, having made this switch recently, has some ideas for me. I'm thinking that my money might be better spent at a Mac store for a new Mac than on eBay for last year's model. A new Mac would get me more power, a better warranty, more choice in what I get, and the newest version of OS X. Now I've narrowed it down to three Macs:

1. A Mac Mini as souped up as I can get it
2. A mid-range G5 iMac
3. The cheapest G5 PowerMac

I'm still open to ideas, especially from anyone who has made the switch or is familiar with Macs.