Higher Efficiency Speakers


I am going to start my quest for speakers. My room is 13.5x13.5 but open on two sides... so not an ideal space. But never the less this is what I have to deal with.  I have a set of Vandersteen 2ce Sig ii but would like to upgrade. Was thinking about something horn. But seems when you go that route it gets way out of my price range.  Thought maybe look around for some Used Vandersteen Quattro CT but budget starts to stretch at that point. Like to stay under $10,000. What would be good speakers to look for to demo? If my room was alittle bigger.  I’d almost go the other way, and look at Small Maggie’s and Monostrap my amps.
System
Atma-sphere M60
Atma-sphere UV-1 ( Probably the most Modded. Will be at the end of the month. Lol) 
Bel Canto Dac

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While I love my current (and I hope final) system, If I had it to do over, I would go with high efficiency speakers (100 db+). They give you so many options in amplification. I'd love to try the Pass Labs XA25, 300B amps, etc.. And they still let you use high-power amps. Very versatile. 
Audiokinesis speakers are terrific and are commonly married to Atma-Sphere. Duke LeJeune has great taste in sound. They are front loaded horn hybrids but strike me as a blend of a wave guide, although I may stating this out of turn. Fatigue free sound with option of an even sound distribution like dipoles. 


You might want to take a look at these. They check off all of your boxes, and have received many great reviews.

Spatial Audio X2

http://www.spatialaudio.us/pagex2/
Daedalus speakers are 96-97 db efficient
very dynamic, tonally balanced and engaging

lou Hunkley crafts solid wood speakers with a vibrant  realism