I previously owned a pair of Reference 3A MM De Capo(i) speakers and found them to be fantastic in a medium/small room. For me, they had enough bass to not need a sub (I'm not a bass head). An all around great performer and very easy to drive. I used amps from 3.5 w/channel 2A3 SET Tube amps, up to 70 w/channel Class - A solid-state mono blocks. Having a speaker that is easy to drive, and compatible with a wide variety of amps, will open up a lot of amp possibilities for you.....
I have not heard the current Reference 3A MM DeCapo Be speakers, but I'm sure they treat least as good as my previous version.