Ended up buying a pair of Beyerdynamic Custom One headphones off ebay for 150$.  Couldn't seem to find a much better deal.   Now I'm curious how those compare to the other headphones mentioned?   I was considering ordering another pair next week.   What would be a good comparison out of...

Ah I was just reading on the Beyer Custom One Pro.  If you had to rank those in order of preference for the music I listened what would your ranking look like?  Also any suggestions on places to get them cheaply?  I know the Ultrasone are fairly cheap on amazon.

I'm looking for some advice on a pair of headphones around 300$ or less.  I will primarily use them at my desk at work (software dev). The people in the adjacent cubes aren't cool with playing music over the jambox or laptop speakers so I'm not entirely sure a pair of open/semi open would fit...