I think you should give the Lores a try, regardless of the drivers used and 'simple' crossover designs, I have yet to read ANYTHING but positive reviews of his speakers. As for the high efficiency ratings, personally I think that just opens the door to experiment and try a multitude of amps, including tube amps.
Here's an excerpt from a review on the Lores...
"With the exception of a few caveats that I'll cover a little later, these speakers are game changers that set new standards for what can be expected in world of "affordable" high end audio (4). Looking back over the past fifteen years, the only sub-$1000 speakers that I would say can compete with these overall would be two that I happen to also own; the long discontinued Sound Dynamics 300ti and my current reference Direct Acoustics Silent Speakers… and maybe the Magneplaner MMG. However, in most regards, I find the Tekton Lore to be superior to these other speakers in significant ways."
http://www.positive-feedback.com/Issue60/tekton.htm