I have an older Unison Unico (1st generation from 2003) that I love so much, rather than replacing it I recently had it modded by Underwood HiFi. It is still going strong! Never heard the Kinki, but hard to believe it destroyed the Nuovo. See the StereoMoJo review of the Nuovo: http://www.stereomojo.com/Unison%20Research%20Unico%20Nuovo%20Review/UnisonResearchUnicoNuovoReview....
Because of the tubed front end, I suggest doing some tube rolling. I get fantastic sound using Seimens 12au7 tubes. Incredibly musical!! Some reviews of the Unico:
https://positive-feedback.com/Issue61/unison.htm
http://www.6moons.com/audioreviews/unisonresearch/unico.html
https://www.stereophile.com/content/unison-research-unico-primo-integrated-amplifier-page-2
Used they seem to run in the $900 - $1,400 range.
Best wishes for whatever you select.
Because of the tubed front end, I suggest doing some tube rolling. I get fantastic sound using Seimens 12au7 tubes. Incredibly musical!! Some reviews of the Unico:
https://positive-feedback.com/Issue61/unison.htm
http://www.6moons.com/audioreviews/unisonresearch/unico.html
https://www.stereophile.com/content/unison-research-unico-primo-integrated-amplifier-page-2
Used they seem to run in the $900 - $1,400 range.
Best wishes for whatever you select.