Z-Review - Sony MDR-7506
One of the best sub-$100 headphones I have heard. Would be amazing for portable use if you can deal with the cable. $85 [http://amzn.to/1ykn0d6].
Part II Sound Demo here [http://youtu.be/8A4VX9D0oec]
Full headphones Recommendations list: http://www.reddit.com/r/zeos