I just bought a pair of Audio-Technica ATH-A900s, and they are awesome:
Although they are far from being easily portable, the sound quality is excellent, the closed design means that I won't annoy my officemates with my music, and the low impedance (40-ohm) means that I can drive them well from my iPod without an external amplifier. Most importantly, they are the most comfortable headphones I've owned by a mile. (Supraural designs have always hurt my ears a lot; these are circumaural cans with a unique support mechanism to place some of the weight on the cross-band and minimize the amount of compressional force needed to keep them on the ears.)
What are you currently using?
Although they are far from being easily portable, the sound quality is excellent, the closed design means that I won't annoy my officemates with my music, and the low impedance (40-ohm) means that I can drive them well from my iPod without an external amplifier. Most importantly, they are the most comfortable headphones I've owned by a mile. (Supraural designs have always hurt my ears a lot; these are circumaural cans with a unique support mechanism to place some of the weight on the cross-band and minimize the amount of compressional force needed to keep them on the ears.)
What are you currently using?