Good amp match for vinatge Vandersteen 2C's?

I've owned the 2and 3s, as well as the RM10s, but never together. I will
say that the RM10s are one of audio's magical amps, and if John Rutan
says they are compatible in terms of power, then I would think the
recommendation is one to seriously consider. Someone told me that the
best he ever heard the 2ces was when driven by an RM 10.

I would not take anyone's description of the current Signature to get a sense of how it might sound different than what you have, you would have the illusion of thinking you really have the answer to that, but you really need to hear it with your own ears. Don't you have a Vandersteen dealer near you? They are pretty broadly distributed. If you are near Audio Connection in NJ, you can even hear what a lowly 35 watt tube amp might sound like compared to a 100-200 watt SS amp.

I would immagine old SS like you mentioned would have to have the capacitors replaced by now if it hasn't been done already.

I'm not sure why, but it sometimes seems that some folks think that Vandersteens are not tube friendly, which is curious given how often they were shown with ARC in the early days -- and Richard owned Quicksilvers (still may). I wonder if it is sometimes confused with another famous 1st order xover, phase and time coherent speakers that really are not very tube friendly.

Agree with everything you said about John Rutan.