Can you get a really cheap mac at all? Like something in the sub-$500 range? Can you build your own Mac yourself at home? Most of the sites I've bought computer parts at don't sell any Mac stuff except memory, and if there's a cheap pre-built one I've not seen it.
I realize guys that like their Apples are pretty touchy about it, and I don't mean to offend them, but I doubt I could get by with a Mac. First is price- given that the parts are readily available (and I have some parts lying around) I'll likely build another PC before long. For about $400 (+I have a spare case, sink/fan, cables & PSU, as well as a couple optical drives) I can build a P4/2.8-3.0. The computer I'm typing this one is a 2.8 * Celeron and I bought it with monitor for $450. To be fair, I've upgraded it in many ways, but that's the rub- I can afford to work with a Pentium. For the guy who can "roll his own" (and it's not difficult to build a PC), a potent machine can be had for under $1k.
That said, if it's possible to buy the parts (proc, mobo, graphics card, etc) to build a Mac on the cheap, I'd be interested in a link, if you have one. I do plan to build a 2nd PC, and then configure the slowest one as an internet-only PC.
I will say that I've been a Windows-complainer most of my computing life, but I really like XP. On my PC it's very stable, and just a joy to use. But, and it's a big "but", the security is pathetic. I have a very complete suite of the best security software and I keep all definitions up to date religiously, but I've still had adware/virus problems, and that's behind a router too! I've finally given Internet Explorer the boot in favor of Firefox, so hopefully that'll help. Hawke, I'd say if you've never had a virus or spyware problem, you're either blessed with godlike computer knowledge or astonishing luck.