Suggestions for high efficiency speakers?

Good entry, kirtgunn2, thanks to you and everyone else who'se weighed in on the subject. I have a lot of speakers to explore but I like what I have so I'm in no hurry.

Yet another Tannoy!

Kirtgunn mentioned engagement, yes, this was what hooked me on first listening to stock Klipschorns in my system. Part of this engagement for me was this uncanny sense of live performers in my room, something I'd not heard prior with the many speakers I'd previously owned.

 A number of years later, the Klpschorns are now after umpteen modifications  like a living, breathing entity brought to life by an elixor of SET amps, DHT preamp and  high resolving source. I'll never leave my horns.

Before I purchased my speakers, I went on a one year cross country (east to west) speaker hunt.  I owned Wilson and Sonus Faber speakers prior.  I attended many audio shows also.  I never thought in a million years that I would end up with a horn speaker until I heard one in the same room with the likes of Eggleston, Stenheim, Meridien, Vandersteen, Vivid  and KEF.  The horn was Avantegarde.  From that point on I searched only for Horn speakers.  I considered Charney, BD Design, hORN, Avantegarde, Deja Vu, JBL, Klipsch, Tune to name a few.  Then someone mentioned this boutique horn builder in Sante Fe, NM called Viking Acoustic.  I went to the builder/designer's studio and was immediately impressed.  I ended up buying the Viking Grande Voix Dual horn speakers.  They blew away my more expensive Wilson and Sonus Faber speakers.  While the GV's may be over your price range, they do have many speakers in their line to consider.  You should give David Counsell a call at Viking.  

There was a pair of Emerald Physics 2.8s (open baffle) original MSRP $10K, now discontinued you can buy for ~ $3K on a competing used equipment site

Highly recommended