Beyerdynamic DT 1350... Though you will want an amp for them to truly sound their best.
If you don't mind sacrificing a bit of looks for good sound, you should also look into the Sennheiser HD25-1 II.
A lot of people here seem to really like the Phiatons--while I've never heard them myself, they are certainly very attractive looking phones, and in my readings, the sound gets a lot of praise, for what they are.
Edit:
Also, how do you listen to your music? What kinds of music do you listen to? What sources do you use? Are you looking for something portable or not? Would you mind getting an amp to go along with your headphones? Do you need something open or closed, or noise-cancelling? The more you narrow it down, while keeping an open mind, the more likely people here will be able to give you a truly good recommendation.