I would throw in a few well down the price spectrum....
A 2020 based T-amp
A 3886 based Chipamp
First Watt (any of them)
And a couple monsters:
Pass Labs X200.5 Monos
VTL Siegfried Monos
The surprising thing is how much music can be had for $50 and how little the enjoyment changes with $50,000 at times...