Efficient monitor to pair with a Sonos 120

I am looking for an efficient bookshelf monitor that will be powered by a Sonos 120 - 55 watt digital amp. I have a Velodyne 10" sub to help with the low end. My room is 12 x 20 with 8 foot ceilings and I listen to jazz, soft rock, and run my tv's audio thru it for movies. I am currently using some B&W CM5's. They are quite good but I think these speakers need more juice to get the most from them.
Omega Sound Systems makes some terrifice high efficiency monitors. They have good forum on the Audio Circle.
some klipsch forte, chorus quartet etc