Thanks for all the advice!   I bought the Beyerdynamic DT880 600 Ohm and a MicroMega MyZIC amp from a local audio shop. They're extremely comfortable. Sometimes I forget that they're here.   It's definitely a different experience with the open back. I'd say these don't sound nearly...

I want something open air and super comfortable so that I can listen music accurately while I work, for several hours at a time - maybe even all day - and also be able to pause that to skype over google hangouts and then be able to hear myself talking (with my closed headphones I always take 1...