Given that you're coming from HD580's, and you were happy with them, I would recommend sticking with that line/sound signature -- the HD600's. They're really some of the most comfortable headphones out there, and properly amped, they really shine. That said, I have absolutely no use for such an open phone. I like DT880. I use VTG's for office use, because I need really closed. I should probably consider going back to the DT770.