No matter what company you are talking about, remember that they are in the business of making money. This isn't to justify what Apple does. I wasn't happy when they promised to support all PPC machines with OS X before it was released and then changing their minds once the final versions came out. However, the developer community has been wonderful in regards to this thanks to XPostFacto.
Microsoft is out there to make money also. Consider the requirements for the upcoming Windows Vista. Good luck using a 500 MHz PC with that. What?? You'll use Windows 2000 or Windows XP? Well, consider that Windows 2000 is coming up close to being totally unsupported by MS and Windows XP will shortly be there once Vista has rolled out. And if they won't suport your with critical updates, where does that leave you?
And no, you won't save any more money with a PC. This is one of the biggest fallacies that PC users fall for. Most of the cheap PCs come with crappy graphics that suck the power out of the CPU, reducing performance even more. Sure you can add a video card, but add the cost of the video card as well as more RAM and you're once again looking at the price of a comparable Mac. And it will surely be obsoleted sooner than you think.
As for Windows users running iTunes, consider that it only runs on Windows 2000 and above. Sorry Windows 98 SE users....I guess you have to upgrade to Windows 2000. What?? Your computer doesn't have enough memory to run Windows 2000? Time to get RAM...
ka-ching! For the record, Windows 2000 still costs more than the latest version of Mac OS X...more
ka-ching. In the end, it's going to cost a pretty penny using a PC.
Unless you go with an open source solution, you're going to look at spending some money. Personally, for the prices mentioned by ElDiabloConCaca they aren't all that bad. It's better than spending the 200-300 bucks for a new system that will be underpowered, only leaving you wanting more. Don't make that monetary mistake. If you can spend the money for a PC, get the newer Mac OS X. Or get a newer Mac than that one (again, they have longer staying value hardware-wise). There are various vendorrs that sell used Macs for good prices (check
http://lowendmac.com for a list of vendors). You'll be pleased.
Also I will reiterate that hardware-wise, you can only get so much out of a computer. I have an older StarMax 4000 that is running Mac OS 9.1 and Debian Linux. It's usable, but it's far from a speed demon. You can only get so much out of your hardware before it's time to upgrade, and you are looking at an old computer.
Ultimately the choice is yours, but I think you ought to think this through before you switch back.