I've never owned a Mac, but everyone I know that has one is extremely pleased with them. A friend of mine has one and has had it for over a year and it hasn't crashed at all. That in itself is amazing to me. Computers crashing is just a part of life with PC.

I'll probably always own a PC though, my work uses PC and they have a pretty attractive purchasing program and pay a part of the cost for a new computer for me every three years. It just has to be a PC and be compatible with the computers we use at the office. I'm due for an upgrade now, but I'm stalling because of Vista - haven't heard anything good about it yet. So I'll hold off until they get all the bugs worked out of it.

As with everything - it ends up being a personal preference thing.