Thanks for the great suggestions. I have dwindled my decision down to three models: Shure SRH440, ATH a700, and Sony 7506. I work in video production and will use the headphones for audio mixing/editing for video, as well as viewing movies and listening to the occasional pandora on downtime. My main issue here is comfort. I have big ears compared to most people. At work we use Sony MDR v600 and they fit my ears great. So my reservation about getting the 7506 is the shape of the cup is more rectangular than the v600 and I am worried that it may rest on my ear. The intrigue about the ATH a700 is I hear they're pretty large. I'm expecting to wear the headphones 6-8 hours at a time and comfort is a huge issue for me and I don't want to make a bad decision and have to ship a set back. Has anyone used these and have anything to comment as to their comfort?