Get the Mac.
You'll never regret it.
For one, the performance is better than ME, XP, VISTA, Win7. Evidence via properly controlled studies?
Shutting down is only 3-5 secs (I kid you not) ! That's a plus point? Great. My linux OS shuts down equally fast! wow... I'm so impressed.
No viruses(at least not in the wild yet) linux has been even more virus resistant, and i think in a recent challenge, a mac was the first to get hacked?
Interface is much easier to use. Boils down to preference I guess.
Doesn't crash as often as MS products Again, where are the statistics? Doesn't that depend on the make of the pc and if the os and software were installed properly?
If you still wanna run Windows on your Mac, use Parallels, Virtual PC or some other virtualisation software amazing. spending so much more seems more like a good decision now! I can go back to good old windows in the event that OSX can't do something windows can.