I have a year old Macbook pro, a Powerbook (I believe that's what it's called), a Dell D620 Latitude, an Inspiron, an older Dell desktop, and a PC that I built.
Ever tried to replace a hard drive in a Powerbook? Ever tried to put a new power supply in a G5 desktop? Ridiculous. I can fix anything that goes wrong on a PC; with a Mac, even something that should be simple, it's almost not worth the time.
Also, software is much easier to find for a PC.
I'll take a PC any day.
That's the reason I switched to a PC. I owned two mac's for programming music. I would juice them til I just had to buy another one. But when I would upgrade the processors, they would start locking up or crashing. So, I just lately upgraded to a built PC. So far, good. Also, I got way more software for it.