I'm personally a fan of PC's. While many of my family members extoll the virtues of a Mac over a PC, Macs are not dynamic (you throw em out when a better piece of technology comes along), while PC's can be customized throughout their lifespan. Also, games just run better on PC's.
And I was sitting in class today and the teacher was using a Mac... it froze and he had to reboot. Never seen that happen at school with a Windows computer hooked in.