Another vote here for David Clarks. I've had a set since the late 1980s, they've given excellent service, probably done about 7000 hours with them. I've replaced the Gel seals two or three times and mic muffs about a half a dozen times. I've never had a problem with their comfort. I've also flown another 6000 hours with company provided DC's.
I've also used various models of Telex, and Lightspeed.
If I were to buy today I'd buy the David Clark One X noise cancelling. They're quite expensive, the equal to the Bose A20 on noise reduction, but based on prior experience with CD headsets I'd expect them to be long lasting.