I can vouch for the TMA-1s. I had a pair for a year and a half. Then they snapped in half, which was unthinkable, because they had withstood an unreasonable amount of abuse from me. In hindsight, that might have been the cause...I literally threw them against a wall once to prove a point.... Anyway, AIAIAI gave me a deeeeep discount on a replacement pair, which was awesome of them. They're not flat, but they're wonderful to listen on, and honestly once you get used to their response they're very nice to produce in in a pinch. They're not a very flattering headphone. Bad mixes sound bad on them. I do a good deal of my work in them, but I don't do my final mixes or my masters in them if I can avoid it. Also worth checking out: AIAIAI TMA-1 Studio. Haven't tried them, but I've heard great things.
Beyerdynamic DT series is also pretty nuts. I'm not a huge fan of them but I've tried them and they're impressive.
Sennheiser HD-25-1 ii is the DJ standard. Apparently not particularly comfortable but built like tanks, parts are individually replaceable, and strong sound.
V-Moda Crossfade LP are ugly as shit and not particularly well-built but they really do sound quite incredible. Probably not great for producing though, they're a pretty flattering set.
(FYI I'm a computer music major, been producing for 3 years, DJing for 2 1/2. I'm not a headphone expert but that experience is where my opinions are backed from.)