I own the Yamaha NS 5000 (no opinion on Vienna Acoustics or ATC) and it is well matched with Magnum Dynalab Integrated MD 307 and 309 (I own the less expensive 307). Both within your budget but midrange is not forward. The soundstage is deep, wide, clearly spaced instruments and vocals and natural sounding. Another outstanding option for the NS 5000 but above your budget will be the Ypsilon Phaethon. Used will be about 10-12K. Others spoke of Octave and I will also recommend. The Octave 500SE preamplifier with their MRE 130 tube mono combination will meet the asking requirements. All 3 Octave components are slightly higher than your budget and difficult to find in the used market but worth exploring. Good luck. No affiliation with any of these brands, except as customer.
https://octave.de/en/htdocs/verstaerker/mre130.php
https://octave.de/en/htdocs/verstaerker/hp500se.php