Speaker and amp pairing

millercarbon and knotscott make the most sense here. Impedance, watts, sensitivity, etc., all come into play. Looking at those numbers and pairing with an amp certainly come into play. However, numbers are that,,,just numbers.
An example....Years ago I was playing Klipsch speakers(Reference line) through a not lower line HK receiver. Watts and all those numbers seemed compatible. The sound to me (in those days) was pretty good. Then, I got a good deal on a NAD integrated and hooked them up to those Klipsch speakers. Sounded like I threw 3 Army blankets over each speaker. Not wanting to ditch the NAD amp I investigated other speakers. PSB was the final result. I believe the two companies are, or were combined.
The main point here is that no matter how long you compare and try to match numbers, there is no final answer until the speakers and amp together are listened.

Whilst giving a greater choice of amplifier the problem with choosing speakers only above 92dB is that severely limits your choice, of speakers. In the old days our choice of computer was often limited by the amount of storage and RAM today both are cheap.  Today watts are cheap too. A Peachtree Decco 125 will drive anything, sounds very nice too. Go up market and a Naim Nait XS 3 at 70 watts will drive virtually anything, a Cambridge Audio CXA 81 at 80 watts also will at half the price. Speakers at 92dB however choice is limited, Klipsch, not a fan (that's me being diplomatic), Focal may squeeze in at 91 dB ( however they are very bright) others at that rating tend to have horns, think listening to music thru a megaphone and or be very expensive see Tannoy, of course you can have a Zu audio product complete with whizzer at 110dB, great for those who like Harleys but better off with a BMW, Yamaha or Ducati if you actually like motorcycling.  Your are not going to find any from Dynaudio, B+W, or my favourite Audio Physics and many other brands. Pick speakers you like then buy an amp that will power it, plenty of speakers at 86+ dB to choose from, hundreds of amps about to power them.

I'm with Henry. I don't get the obsession with sensitivity, especially when transducer engineers often deliberately choose a lower sensitivity driver set to get improved bandwidth performance.  It should be noted sensitivity is relevant only in passives.  Most actives can play as loud as you care to listen, leaving the efficiency argument behind.    

I'm with the last two posters. With modern amps, sensitivity is wholly irrelevant.

Some speakers are very revealing, like ESL's or magnetic planars. Only a very clean amp will sound good with those speakers, but fortunately, these are not hard to find. Your ears will tell you immediately if the amp is the right fit for the speaker. Any dealer should be able to point you in the right direction.

Oh, and ignore specifications. As Jonas Miller (of M&K fame) used to say, "The best audio analyzers possible are your ears."

sensitivity, response, sonic end product, physical end product, cost -- it is all about a fairly complex set of tradeoffs folks