I bought my first pair from Craig at Kuboten. This pair I bought locally about an 8 hour drive away. I had an uncle go listen to them locally to them to make sure they were in good condition.
Most people baby them so you shouldn't have that many problems.
The worst you'll see is some wear/dust on the headband , maybe some compressed ear cushions, both replaceable.
They are very discerning of DAC's though. I think it's harder to find a good DAC than it is to find the headphones
.
They revealed serious flaws in the built-in DAC of my studio's Digidesign 03 rack, and the Apogee DAC I was using at the time was much better.
The Parasound 1100HD is the best I've heard with them, but vintage DAC's like that in my experience have been untouchable.
Your musical taste is pretty much exactly what I found the Omega 2's to be most suited to so I'd say you'll be happy.