If you are just using it for the basics i.e. web, email, music, photos, etc, I would save the money and get a PC. If you are into multi-media projects such as video editing or recording music, I would get a Mac.
I have a small recording studio running Pro Tools so I bought a Mac Pro for the power and stability, but I use a PC for work.
Apples might be a bit more expensive, but they also tend to last a good deal of time. I've had my MAC laptop for about four years now, and its simple and fast. Before that, I had a MAC desktop that I used throughout grad school... a few years lets just say.
Personally I am a MAC fan and think the extra money is worth it, like @lalalauren said they last for a very long time. I had my last MAC laptop for five years, and had little to no problems with it. A PC is not a bad option, but form my experience they tend to break down or have more virus problems than a MAC.