Dunno. I've got a nice pair of Sennheiser noise cancellation headphones which I believe were recommended by Ragman. They're very good, but maybe more so because of my deminished hearing. Unlike the good Bose in the same price range, if the battery dies away from home, they're still usable without the noice cancellation. That probably wouldn't be a consideration for Mo, but I thought I would toss it in. The physical construction is quite sturdy, too.
You know what, though? If he says he wants Dr Beats, that's probably the one to go with - just because.
I bet Rags won't be long finding this thread. The only other I can thing of is Stoat, and he hasn't been around in something like a decade.