For over-the-ear headphones I suggest buying Skullcandy Over Ear Headphones
.[scan down... they have $49.99 sets too]
Skullcandy has been doing high quality headphones for about eight years
A big benefit to buying Skullcandy o-t-e headphones is a single cord rather than two cords. It allows you to move your head more freely.
For in-the-ear headphones, I suggest buying Shokbuds.
One of my favorite parts about Shokbuds other than the crazy bass they make is the fact they are nearly invisible when you are wearing them.
Shokbuds - iamsonic's review