I was running a similar package C2200 and MC 2102 with my Beethovens. The MC 2102 is 100 WPC, not much more than the MC 275. It worked great in my 14' x 50' x 8' listening room. I have the system set up on the long wall, so the room is not a 'big' acoustically as the measurements would indicate. So unless you have a really big room, it should work for you. I hardly ever hit 20 wpc on the MC 2102 meters. That is loud. If you run out of steam, just buy another MC 275 and run them as monoblocks!
Thanks for the kind words. It has been a great journey. Upgrade-itis is slowing a bit.
I have owned a lot of gear over the years, and none seems to elicit such strong opinions wrt audio quality and performance as McIntosh. Their latest batch of amps and preamps is really very good. Since I buy carefully used gear, (except for speakers) I do like the fact that every Mac piece I own has appreciated since I bought it.
My darling bride said: "Why don't you buy more of that McIntosh stuff - I like the way it looks." Yes dear, anything you say!