Speaking from someone who has always been skeptical of Macs and had used PC for 10 years and 3 years ago had to switch to MAC for work purposes all of a sudden, it was like, OMG, this is what I've been missing?! I started with OS Classic, even then the interface was much cleaner, the OS much more reliable, everything work just smoother and make more sense, and just plain easier, yeah, programs still crash once a while, but FAR less often than a PC. Now with OS X Tiger, it is simply a very elegant and easy to use platform, you just have to try it to know what I am talking about. If you burn home movies at all to DVDs, it is so easy on a Mac with iMovie and iDVD, then try to do the same thing on PC, it is like hell break loose, lol.
And it isn't really that much more expensive than a PC, unless you are comparing to the sorts of e-machine. You can get a G5 iMac for $1300, with 17" LCD, Bluetooth and Airport extreme built in.
Mac Minis are nice but they only come with G4, which is adequate for most everything, haven't played with WoW so don't know how Mini handles that, though.
The new G5s are on the expensive side, with dual processors. But if you've got the dough, the ends definitely justify the means.
Sorry it's a little long, got a little excited, time for a beer. (glare)