I was a dj for 10 years in my prior life..I've used pretty much all the popular dj headphones on the market. The biggest issue I have with headphones are POS headphones that break. I used to go through headphones once a year. It boggles my mind how long it took me to find a decent pair that could withstand abuse.
Sony- V500 sounded like crap, broke on me at the hinge
Sony V700- too heavy was not comfortable on my head, too bass heavy
Pioneer HDJ1000- these were pretty good all around I actually had 2-3 pairs but they would snap at the elbow joint on me
Technics the 1200 with the chrome that looked like the sony v700 was nice but was heavy and uncomfortable
Technics the smaller one- much more comfortable great sound. I loved these headphones but then the cord died on me and the cord wasn't replaceable...
My pick- Sennheiser HD25- these are great little cans. They can take a serious beating, you can replace the parts when they break. They put out a punch midbass, makes beatmatching kick drums easy, although that really isn't an issue for the young whippersnapper generation of djs with beatmatching software these days is it?
These are really light and comfortable to wear for an extended period of time. Keep in mind, besides not breaking its also important that they are comfortable for you because you will be wearing them for 3-8 hour stretches. Depending how you mix, pull one cup to the side of your head to see how it feels. Or if your'e the type to leave them aroudn your neck and lean your neck down into try that and see how it feels. To me the durable ones were all too heavy. These senns are perfect!!! They feel kinda cheap because its all plastic but once you wear them for a long time you will be thanking yourself.