Based on my experience, if you are seeking as you say 'peerless musical performance', then the amplifier is the place to start.
I would suggest keeping your eye out for a used McCormack DNA 0.5 Revision A amplifier. It's only 2-channel but you can usually find a used one here for about $1200 $1600 and it should easily outperform any of the amps you listed above.
This purchase alone can catapult your system perhaps more than any other purchase you make in the next few years.
-IMO
I would suggest keeping your eye out for a used McCormack DNA 0.5 Revision A amplifier. It's only 2-channel but you can usually find a used one here for about $1200 $1600 and it should easily outperform any of the amps you listed above.
This purchase alone can catapult your system perhaps more than any other purchase you make in the next few years.
-IMO