Headphones are one of those device categories where more money does not necessarily equate to a better quality product. Many branded, read "designer," headphones cost extra simply because they have a celebrity backing them. There is a single branded headphone line that gets most of the attention and offer a high price tag for entry.
There are ways to more intelligently choose a pair of cans. Make sure the sound is superior quality. Of course, pay attention to build quality, but sound is paramount when purchasing headphones. Start with plastic. If the entire headphone is plastic, start second guessing your purchase. Pulling the Phiaton Bridge MS 500's from the box was quite a rewarding experience, complete with machined aluminum, perforated leather, and red stitching.