IMHO, Stax are the best you will find. Try them first and it may save yo a lot of time. Not cheap, but worth it! I'm sure you will get many other opinions. Good luck in your search.
I really like my Beyerdynamic T1 with matching A1 headphone amp. I auditioned many headphones and amps. Another good amp is a used Musical Fidelity x-can (e.g., V3).
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