As others may have already written, the age of the pads has a huge impact on the sound, so if you don't keep that in mind when comparing the old...
I think this is a quite good deal. $261 @Amazon https://www.amazon.com/Sennheiser-Open-Back-Professional-Headphone/dp/B00004SY4H
I heard that the newly released Neumann NDH 30 is great on the pro audio forum, Gearspace.com, but is it only for studio monitoring? I don't know...
I'm looking for my next headphones. I have been using HD650 for 20 years!
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