At first I wanted these 2 options beyerdynamic DT 990 and Headphone HE-400 but some people say they are open and people will hear all of my music. I want great sounding headphones but at least a little isolation. Now I am thinking of the Denon AH-D400 which people say have a bit more of isolation. I will use my headphones for listening to electronic music with bass, beatles and just so many different genres but mainly Electronic Music. Help me make up my mind please. If you recommend one of the above please let me know the strong points or if you know of any other headphones please post them here.