I have owned the Ultrasone 8s for five years now - they were my first quality headphone. I was frustrated after having headphones with plastic headbands snapping - and figured there were gains to be made in sound quality. I am a pretty active guy, and they have lasted through marathons, inclement weather - you name it. I visited Tokyo once intent on finding a closed headphone that was better than the ultrasone 8 and couldn't find one. Keep in mind my other headphones are Abyss and Stax SR009, so I like to think I am pretty picky when it comes to headphone quality.
The only downside of the ultrasone edition 8 is the fact that the cable is attached, which can become a problem if you are clumsy like me. I ultimately did pay BTG audio about $200 to convert them to detachable cables, and it was one of the best investments I have made.
The only reason I mentioned IEMs was the fact that you said you liked to listen while the misses was sleeping. You can listen to the Edition 8s and not worry too much about sound leakage, but you may have to gauge the volume a bit. I was listening to the Edition 8s in bed with a sleeping Mrs. MaggotBrain when I was responding to your post last night. Mrs. MaggotBrain has ears like a bat and can hear a gnat fart, so there you go. I have not heard an IEM that has the same quality sound at the equivalent price, but you are gaining in portability and sound isolation.