I pulled the trigger on a slightly used HD 650 for $320 after shipping... As for the m50's, I already use the Sennheiser HD515 G4ME, so I don't think that was the upgrade I had in mind.
If I hadn't bought the 650, thanks for the suggestion on the K550, they look pretty good. The high frequency is a little lower than I'd want to see, but I definitely would have considered those.
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