I agree that the Mac is pretty much the same hardware, although if you find Macs cost 2-3 times as much, you're looking in the wrong shops.
I use both PC & Mac, PC most of the time at home (but also Mac), and Mac all the time at work. I would say avoid the Mac Mini like the plague, they are as slow as treacle, just, awful, awful, awful computers. The new iMacs on the other hand are very fast indeed, and a pleasure to use.
The Macs are of course, a good bit more expensive, especially the laptops, but if you compare with a comparable brand like Sony, then the difference is not a lot, maybe 15% more expensive. Nobody here would compare a Leica camera to a Vivitar*, so comparing the price of a Mac to LASERTRON 3000s or whatever sold from a van behind your local fried chicken shop is not really very reasonable.
Windows has come a very long way, Window 7 is actually pretty decent, and runs a lot faster than Mac OS X on similar hardware. However, if you don't mind the extra spend, get a Mac, as you can run Windows as well if you want to. Think of it this way, an iMac is a computer which can run Mac OS X and Windows 7, a PC just runs Windows 7 (I'm forgetting all the *nix OS for the moment).
I've ranted long enough, just that this anti-Mac rhetoric annoys me every bit as much as anti-PC rhetoric. They're just computers, each have pros and cons, get the one you prefer.
*Not truly equating Apple to Leica here, Apple's build quality is not even close to Leica, but it was an easy comparison.