Beyerdynamic DT660:
http://www.amazon.com/beyerdynamic-DT-660-Premium-Headphones... (go for the 770 if you're in a quieter situation, as they're open-backed and you get a bit of a cleaner sound)
Grado is almost always a stellar choice. http://www.amazon.com/Grado-Prestige-Series-SR125i-Headphone...
Both cheaper than beats.
Both much, much better.