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
Phalen, (others) Musical Affairs Grand Crescendo's. We listened to PC music source through a Leben CS-660 integrated 22 watt amplifier, which is really nice itself, and provided more than enough umph! I'm not at all versed in giving reviews, but I can't imagine anyone with complimentary amplifiers etc, not being ultra satisfied with these! The only thing I didn't like about them....they weren't mine!
Vaughn Loudspeakers Zinfandel or the Cabernet. Absolutely fantastic full range high efficiency speakers with a benign load. Ideal for SET amps. Also works with any type of amps.
I am presently using the Zinfandel in my system driven by the Symphonic Line RG1 amp and the sound is gorgeous. It uses the fostex driver, ribbon tweeter and a 12" bass diver.
Thank you Isochrnism. I know that there is no substitution for an audition but one of the shortcomings that single driver speakers seem to be labeled with is that the do a relatively poor job of reproducing dynamics and complex passages. Did you listen to any challenging music e.g., large scale orchestra?