If you can only choose one of these Amps

Not really familiar with any of the amps you have listed ... some of my favorites in the same "used" price category are as follows (in no order):

1. Krell KSA50s
2. Plinius SA50 Mk III
3. BEL 1001 Mk IV
4. Rowland Model 1

First three are 50w/ch, Rowland is 60w so they are all less wattage than any of the amps you mentioned. All of the above are VERY good even by todays standards, and in my opinion, are some of the best ss amps ever manufactured (at least of those I have heard).

Trust your ears, if you can't hear these in your system, you might as well buy whatever is on the goldenarse award list.

I use to own a Classe amp matched a Classe pre-amp and used Harmonic Tech cables throughout. The sound was amazing and far from fatiguing. You don't seem to mention any tubes so am just going to throw one in there. I own a Golden tube SE40 that is great and is a legendary piece.