Brett, if you like the HD580 sound, give the HD 700 a listen too. You can pick those up at a decent price well under MSRP. They are smaller and lighter than the HD 800/800s. I have a set with Dekoni pads and they are nice cans.
https://en-us.sennheiser.com/audiophile-headphones-high-end-around-ear-hd-700