I use a pair of Wright-Sound WPA3.5 (2A3) amps with my 3.6's. No problem filling up my room, and no problem at all with the sound quality. I listen mainly to classical (string quartets, small scale orchestral, and jazz).
But - I have a CAT preamp (high gain) which does make a difference over conventional gain preamps. My room is about the same size as yours, has carpeted floors and drapes. So a 50 watt amp shouldn't be a problem.
But - I have a CAT preamp (high gain) which does make a difference over conventional gain preamps. My room is about the same size as yours, has carpeted floors and drapes. So a 50 watt amp shouldn't be a problem.