Best high-efficiency speaker under 10K


I have never played in the high-eff speaker / low-powered amp space, but I've read so many things that I would like to give it a try. I own an EAR 859 integrated amplifier, De Paravicini's interpretation of SET. It's pretty incredible, especially if you consider its price tag. I am now in the business of choosing the right speaker. I listen to a lot of jazz and vocals and opera. So, I can do without the sub-40HZ frequency range. I would like to stay between $3K to $7K, certainly below $10K. Here are the options i am considering:

1) Zu Audio Essence.
2) Beauhorn Virtuoso (single driver)
3) KCS louspeakers (the model that uses the SEAS exotic driver)
4) Devore Gibbons 8
5) Living voice Avatar

If I had to choose right now, I'd go with the Beauhorn, but I know their limitations.

Any thoughts/personal experiences with the above or any other speakers in this range? Thanks.
ggavetti
I have owned the following (love the high sensitivity speakers)
Beauhorn, Lamhorn, Exemplar horn, Tonian TLM (original model), KCS Seas Exotic, and currently use the Tonian Classic 12.1s.
I have listened extensively to several Horning models (Alkabiades, Agathon Ultimates) as well as the Gibbon 9's and silverbacks and the Living Voice Avatar OBX

All these speakers, and several of the other mentioned, have great qualities.
I love the Hornings but find they like to be played a bit louder than some of the others to really gel but boy are they nice.
I prefered the lamhorn with the AER driver to the Beauhorn with the Lowther in my systems (used severl different amp preamp combos...mostly all SET 45,2A3, 300b, 845 based) but both are very good

The KCS are great and definately a value winner....I had the ones with the original single SEAS driver but see that John now has a version using the RAAL ribbon...I bet these are great

For me, I love the Tonian's with the modified Raven ribbon and Phy drivers....just a great, musical take your mind off anything high-fi speaker...seem to me, in my system, to be less overall compromised than any other I have had or heard.

I run mine with a Berning ZH230 (the new one) and have what I think is the best sound I have gotten in my room.

I think you would do well with any of these speakers if you really pay attention to your own preferences, put them into the right system and then just enjoy the effortless, musical sound such transducers are able to convey.
Don't buy anything without hearing the Audio Note AN/E Spe and the Tonian models.

DeVore are very nice speakers but not really HE, and they don't sound like it. Yes a 300B will drive them but they do not give the dynamics and nuance of an HE speaker.

PHY, Supravox, and Ferting WB drivers on a simple OB can be incredible.

Beauhorns are very nice but not available new - very rare.

Fostex back horns (Cardersound, Cain) are certainly worth considering. Many prefer them to the far more expensive drivers. They are not as detailed but frequently win in the fatigue department.