I almost went with the NAD HP50's to use as a semi-portable headphone with my Pono, but passed due to several complaints over comfort/fit on larger heads over at Head-Fi. I have a large hat size and was a little concerned. I settled on the fairly new Oppo PM-3's, but those are a little above the OP's price range ($400).
The wired Senn Momentum 2's are well thought of, but the wireless version not as much. The M1's were a little thump for my taste.
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