I feel that SETs are the way to go here - you now have a speaker which allows you to choose amplification based on quality, not power. With my Duos (or Duos I've heard elsewhere), amps which have performed superbly include Lamm ML2s (18 watt monos) and Audiopax 88s (30 wat monos). Also reputed to be an excellent match is the 6 watt Art Audio PX25 (can be had in stereo or monoblock configuration). Please spend time getting the setup right - search other threads on that topic - these very revealing speakers really reward proper setup.
Enjoy!
Enjoy!