Threshold, Levinson, Bryston, Krell, ?others? used amps

Hi All.  I'm looking for a bang for the buck, diamond in the rough, 200-ish WPC power amp that will hang really tough with what's out there today in the vintage or recently new realm.  Trying to keep $$$ under 2K.  I currently own a Nakamichi PA-7 (Nelson Pass Stasis design).  Looking for an amp that is great at doing the disappearing act, smooth sounding, but not colored, and with lots of authority.  I realize that there are as many opinions on this as stars in the night sky but thought I would ask anyway.  Been considering a Threshold S/500, Levinson 23.5, Bryston 4B family.  Any standouts that I should try to find?  Let's hear from you.