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
Consider Silverline Bolero's. 92db and easy to drive (impedance curve wise). Dynaudio drivers including the Esotar tweeter. Full range and very smooth FR. Polite upper-mid range makes them non-fatiguing but they remain very revealing non-the-less. Excellent imaging and great looking as well. They cost 12K new. There is a pair for sale on A-Gon for 4695, about 50% of their price. I've had mine for 3years and haven't looked back!
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Tvad, you put way more weight to half-hour listening sessions in a hotel room than I do. In my experience, listening to a speaker in a hotel room with equipment that is very different from yours is not very informative. The beauty of audiogon fellow travelers is that they have lived with a particular speaker for long, and they know it inside out. Plus, you can get leads like what suggested by newbee on pieces of equipment that you would have not considered. While I knew about silverline, they never came to mind before newbee mentioned them. So, thanks for your comment, but I still think there is a lot to be learned from fellow travelers.
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Zu Essence blows goat. Cheap Ribbon, poor integration.

Devore is great but a little warm and not as transparent for my taste. BUT I have a good friend that builds $15k plus guitars and he loves Devore speakers.

As Tvad said, you need to listen for yourself.