this one is hard to beat the more you look at it. Linear Tube Audio Z10e will power sensitive (above 90db) speakers, and any headphone out there. and it’s not ordinary sounding. not cheap, but won’t break the bank, sold direct. an ’end game’ product in a small form factor. it’s what i would buy if i was asking the questions you are asking.
https://www.lineartubeaudio.com/products/z10e-electrostatic-headphone-amp-integrated-amp
to get user feedback i would recommend visiting a serious headphone forum such as;
https://www.head-fi.org/forums/
or read the Herb Reichert stereophile review.
https://www.stereophile.com/content/gramophone-dreams-45-ta-solitaire-p-headphones-ha-200-dac-headph...
https://www.lineartubeaudio.com/products/z10e-electrostatic-headphone-amp-integrated-amp
to get user feedback i would recommend visiting a serious headphone forum such as;
https://www.head-fi.org/forums/
or read the Herb Reichert stereophile review.
https://www.stereophile.com/content/gramophone-dreams-45-ta-solitaire-p-headphones-ha-200-dac-headph...