Suggestions for high efficiency speakers?

The Audio Note setup at Deja Vu is better than what was at the show.  Also, they have their own custom systems that are terrific sounding and they can show you what medium and low-powered tube amps can do with even not so efficient speakers like Harbeths and ProAcs, and Nolas.  Even very low efficiency speakers, such as the Falcon LS3/5A sound great there with modest output tube amps.

@fosolitude

Volti Audio high efficiency speakers seems to be relatively transparent/neutral and have garnered very positive reviews:

Volti Rival 100dB $11.5k+

Careful auditioning is primary with matching amp and speakers.  I fell in love with the Fyne 702, powered by an esoteric f03 class a 30 wpc.  The esoteric was not in my budget to I tried the less costly a/b amps in the series, but the synergy was lost.  Bit the bullet and bought the demo, and ordered the 702.  Hooked the amp to my paradigms and it was awful.  The low powered amp could not drive the smallish bass units.  So the esoteric sat for 6 months while my speakers were having drinks in Glasgow waiting for a shipping container.  The paradigms and the Fynes have the same db and ohm specifications, yet totally different results. 
love the Fynes. Have never heard the high end klipsch models.  The lower end models are frequent sellers on the swap markets 

Palpability, tone, etc. are all virtues I would give to my pairing of Zu Omens and a Decware Zen Triode. Went as loud as I liked but it also made for some amazing low level listening nights where you could just sink into it. My music tastes and budget have changed since then but I'd go back to it in a second system anytime. 

Well, since you are looking for palpable presence, proper tone, and high efficiency the you should certainly give Daedalus Audio a serious look. All that in spades.