While you will have a few choices thrown at you I'll start by suggesting a speaker from Coincident Speakers. Extremely efficient and your 40 w/ch would be most palatable...
I have heard the Vandersteen Model 1's sound good with a 30 watt Berning EA-230 and the Quiksilver GLA. Although they are a low cost speaker, using a good tube amp "wakes them" up a bit.
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