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
When I made my journey to RMAF listen to speakers, the primary quality I sought was the ability to make me forget about the system and focus entirely on the music.

The speakers had to disappear, and they had to free me from critiquing the sound reproduction.

I made my purchase decision when I found a speaker that did this better than the others.
If It were my money I would move KCS up to top position in your speaker hunt.
For the money you are wanting to shell out I think you would be hard to pressed to find better than one of JohnK's offerings from a bigger loudspeaker manufacturing concern.I have a pair of KCS Oris 150's bought as cheap as chips on here, the previous owner of my 150's I beleive had a pair of Avantgarde Trio's prior and I beleive he prefered the KCS 150's, and at a fraction of the cost new. I have personally not heard any of the Avantgarde range of speakers.
Gawdbless thanks for your suggestion. I haven't heard a single person criticize the KCS's, ever, which means they're really good. I have two extra-audio issues with them. First, I don't like their standard look (while many other speakers in this niche are prettier to my eyes). Second, I am not sure what their resale value is. From this standpoint, a more mainstream brand should be a safer bet.
I would suggest building your own, I just did it and could not be happier. There is a designer and a cabinet builder I can put you in touch with. Here is the designers site, mine are pictured through the link.

http://www.clearwaveloudspeaker.com/Symphonia/Symphonia72.html

These are my actual speakers driven easily with 30 watts.
Ggavetti, I can understand where you are coming from, but for me personally a speaker is a speaker and they ain't pretty,lol. I would go for sound quality everytime rather than the look of a speaker, or its resale value on the used market, I mean you could very well end up with something not as good as a speaker made with a personal touch just because it holds a better 2nd hand value than a non mass produced piece of kit?! If on the other hand you bought a 2nd hand pair for the price of a bag of chips you could/should be able to recoup what you paid if you decided they were not for you in the end. No loss. Result.
Then again there is always a plethora of reasonably priced lovely sounding gear on here, either way buying wisely should mean a lossless investment.
Let us know what route you decide to go.