Best monoblock amps for $2000 used

+1 Quicksilver! Here ya go!
http://quicksilveraudio.com/products/midi-mono/

why is monoblock so important?   a good stereo amp is better than maybe not as good mono's

Odyssey Audio Khartago Monos: $2000 new...

markj941,
These guys are very reputable. I’ve been dealing with them for 15+ years.
Classe’ M700 monos
https://m.ebay.com/itm/Classe-M700-Pair-Mono-Blocks-Audible-Elegance-Cincinnati-Ohio-/162715839410?_...
Good luck in your search.

N

I have a pair of Quicksilver Mid Monos , paid $1050 used, like new only a year and a half old....   honestly if I paid $1895 new i would still feel like it was a tremendous value......   40 watts with stock EL34 which sound quiet good.   45 with KT88s , ive run them with both and really like the KT66 that are in them now.....   put it this way, if i ever replace them I will never sell them.  They are that good.   And if i do it will be with a pair of 120 monos