My speakers (EgglestonWorks Fontaine) are not the most efficient (Dynaudio Esotar tweeters), but I am able to drive them to satisfying levels in my medium/large room with Audio Mirror 45 watt SET monoblocks. Rated at 45 watts, but Vlad says more like 55, with peaks to 90. And I do love their glorious SET qualities.
http://www.audiomirror.com
http://www.audiomirror.com