Integrated For Revel M20s

You may bypass Pathos and Unico and stick with your first two choices.

I'm using a Musical Fidelity A308 with some F30's and am pretty happy with it. When I had M20's I was using an audio refinement complete integrated with pretty good success. I also owned the Pathos Classic One (version 2), although not while I had the M20's. I didn't have much good to say about it though. It just didn't seem to do anything right.

I would probably try a Musical Fidelity A300 if I were you.

I would also recommend Primare A30.2.

I use to own the M20s. They certainly can take whatever you give them, however, I ran them with a YBA Integre. 50 of the best SS watts out there. They sounded (the speakers, for my taste, do best with a sub and killer stands. the Revel stands are poor and will have more of a deleterious affect on the music rather than the positive affect excellent stands will provide--sorry for this long paranthetical digression) wonderful, but my listening tastes, loudness levels, room size, were conducive to the 50 watts. They do best (hey, what doesn't) with great electronics.

Other candidates to consider are the Krell 400ix and the BV Audio A300s, which is a true dual mono design and will supposedly drive anything. There is an excellent review of the latter at STEREOTIMES.COM. Also, for what it's worth, one of the English magazines (HiFi News and Record Review, I believe) was much less enthusiastic about the Plinius 9200 than the Krell 400ix.