I like getting a PC, because I know I can add and replace things and make it last a lot longer than I could if I had a Mac. I don't know if they are upgradeable now, but when I last used them you got an awesome computer that you couldn't mess with.
I agree with Bingo about Linux. It is about the greatest thing you can get, it just takes a little learning. I just never got it on this computer, but when I replace it, I plan on getting it.