My current set of cans are ATH-M50. I love them to death but I wish the bass had a bit more oomph. Also I don't want to carry them around everywhere for the rest of the summer. (But they do make good ear muffs!) My only other point of reference are PX100s, which had pretty nice low end but lacked a nice soundstage and treble clarity.
Anywho, I'd like to get a little more feedback on the options before I jump in :)