Wow, those Koss sure bring back the memories. I spent far too many hours under a pair of those in my teens and early 20s. Happy hours, to be sure.
These days I wear Sennheiser HD580 cans. That series of Sennheiser is about the only I can tolerate for tonal balance. So many other cans sound boomy, muddy or screechy to me.
the Sony MDR7506 I have at work and they are pretty good, too.