My Dad gave me his spare David Clark 13.4's - he's had them since 1993 and they still look brand new and as was stated earlier, they're are built like a tank. I really like the DC's.
I do have the UND Avcomms that I bought from an ex-aviation student for $40 (they were in brand new condition). I use those as a spare headset for passengers, but they seem to be pretty durable.
You may want to look into Sennheisers. I tried a pair out once at Marv Golden (they main store is based out of San Diego...but it's a popular online store) and I was impressed with the build quality. I did NOT test them in the airplane so I can't say how they were up in the air... but from what other pilots say, they seem to make very nice headsets. I own two different high end home audio Sennheiser headphones and the sound and build quality on those is just impressive.
And Bose, well I won't talk about Bose... don't want to hurt anyone's feelings