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Reading through the comments I've found three good reasons to buy a PC over a Mac.
1) You're too broke to think about cost of ownership. If saving money over the next year is more important to you than saving money now, get a Mac. If you just can't afford to think 12 months out, get a PC.
2) You like to tinker with things. PCs are great for the types who like to pull off the case and put in a new graphics card or add some other bit. If you like your computer to simply work, get a Mac. If you like to work on your computer, get a PC. The same is true for the software tinkerers, the Unix users. If you like to fiddle with your OS rather than use it, you should not get a Mac.
3) There are some esoteric pieces of software that don't run on a Mac. At least they're esoteric to 98% of users. If you must program Oracle databases, for example, you have to run an emulator on a Mac to make it work and your life might be better with a PC.
If you are in the 98% whose needs can be met with both a PC and a Mac, if you don't like to crack the case of your computer to switch bits around, if you can spend a little money now to save a lot of money, time, and pain in the long run, then you're a Mac guy, whether you know it or not.