I'm getting a Mac for one specific reason:
If you play with the machine and mess something up, you can reload the operating system without penalty.
Maybe I'm wrong here, but Windows gives you a limited amount of - at lack of a better word - "reloads" - of its operating system. After that, you have to purchase a new serial #, or, like me, you get a nasty notice every 15 minutes from Microsoft that you have an invalid copy of Windows.
I'm sick of that crap.
Plus, the new Vista operating system from Windows is no great shakes, and demands nearly all users to get a new more powerful computer.
With the Mac, you can run
both the Mac OS
and Windows; even if Windows is "invalid."
Good luck with your decision.