I use a new iMac at work and I have a custom built PC at home that costed me half as much.

My overall thoughts:
I'd trash my PC in a heart beat and buy another iMac.

If you want a quality, durable machine, go with Mac. Don't forget, Mac's can run Windows.

If you're on a super tight budget, go with a PC. Both have their pros and cons. It depends on how it's used. I completely agree that if you're a gamer, PC is what you need.