did you ever go with the HD650's? I have my eyes on them too and was wondering what you could tell me about them. I was wondering how much sound bleeds out from them when listening to them at a fair volume. Also, how much outside noise bleeds in? I was interested in using them to block out noise from my office, and listen to music while i work. I thought the open air (aside from sounding really good and "natural") would help me hear someone calling me while working, or the phone, etc. I don’t want to totally block everything out.

What do you think of them for use in an office with people close by.