I have great respect for MACs but I prefer my pc for what I do. Sure, pc's take it on the nose but then they have a much, much larger base to serve which I'm sure if that was the case, Apple would be no different....
I've been running windows 7 beta now as a server and it has been rock solid going on 4 months now...which, I think this will be a winner for the pc world....
in the end, do what makes you happy...i build computers for friends and you can get the stability out of the pc platform that you get with MACs, just usually not out of the box