tube amps or amps between $1000 and $2000

Conrad Johnson MV60 (EL34s) or MV60SE (6550s) depending on what you listen to. The latter is better for orchestral and rock. They go for $1500-1600 used.
Quicksilver Mono 100s (KT88s). <$2000 used.
Both are superb amps.
Third choice would be a Rogue Stereo 90 (KT88s) @$2k new.