I think sound is dependent on age, as I have gotten older and the cost of standing next to performance monitors has caught up to me I like the highs to be more pronounced. Bass should be there but does not need to overwhelm the room, mids need to be present and not subdued.
To be more on topic...
My HD800s sounded best on my Cayin HA300, I had RME DAC, THX 789, some other crazy stuff but always came back to the Cayin for some crazy tube distortion that just made it sound perfect.
I almost bought a set of the Audiovalve Baldur 300 mono's a few years ago, decided I didn't need a second heating system in the home,,,,,,
https://www.audiovalve.info/shop/mono-power-amplifiers/baldur-300/
Magnepan 3.7 and or Spatial Audio M3, I like dipole speakers! Paradigm Atom monitors have been great at the desk for years, Kef Q series before that always made me go wow when set up right. I have listened to Klipsch corner horns, I had RF7 once a long while ago, and others at the stereo stores...