High value, high efficiency speakers for SET amps


Hi, Gang,
I know that some of what I want to discuss here has been dealt with in other threads, some of them quite old, but I wanted to see if any of you fine, knowledgable folks are willing to help update and consolidate some of this info in a more current thread.
I am currently running my new Audio Note Kit 1 300B SET amp with a pair of Reference 3A De Capo speakers. I think it's a fine pairing and I am really enjoying what the 300B SET experience brings to the table in terms of musicality and emotional connection.
Still the De Capo, while supposedly an easy load due to its crossover-less design (only 1 cap on the tweeter with the mid-woofer directly coupled to the amp), is "only" rated at 92 db efficient, and based on the most recent Canadian NRC specs, that rating may be optimistic.
So, I am toying with the idea of trying a pair of more efficient, deliberately SET-friendly speakers in my rig, something that might also play lower and with greater dynamic swing than the De Capo's. Note that the De Capo's have served me well and I am very fond of them, but I can't help but wonder if my lovely Kit 1 would shine even better coupled to a VERY easy to drive speaker.
Devore and Audio Note are obvious options - the O/96 looks really tasty. Unfortunately, both of those choices are out of my budget, which I'm thinking maxes out (for real) at around $1500. I am willing to consider used equipment.
Tekton Lore 2.0: This is the speaker that Eric Alexander of Tekton has recommended when we've spoken on the phone, based upon my medium-small listening room and amp. I've read the epic "Lore vs. Zu" thread elsewhere in this forum, and clearly Tekton has its enthusiastic fans here. What I wonder is whether the Lore 2.0 has the refinement of the De Capo in terms of resolution, sweet high end and imaging. Audiogon'er Mikirob has pointed me to the many rave reviews of Tekton's speakers and I'm definitely interested.
I've corresponded with the Sonist folks (who are super nice) but their really high-efficiency, nearly-full-range floor stander is out of my budget.
Then there's the "vintage" route, going after some used JBL's or other high-efficiency "classics" from the 80's (or '70's). I am not inclined to go in this direction, but mention it because it's been suggested to me.
And then there's Omega. I spoke to Louis some time ago and he recommended his 7XRS hemp cone model. But I know all the raps on single driver designs and I'm cautious, although I would like to hear from any of you who own or have owned Omega's.
I'm in no rush to make a switch but I am very interested in your thoughts. Thanks, folks!
rebbi
Pretty much all amps get more strident when overdriven. Soft clipping helps but one is always well advised to not make an amp work too hard. Nothing special about a set except you get fewer watts before bad things become prevalent.
Mapman: Not sure that is what Atmasphere was referring to. He doesn't tend to state the obvious.

Charles: I realize many factors come into play. You might recall a thread of mine. My thinking is revolving around an active 4-way system and the ribbon tweeters I'm looking at are 102 dB sensitive and 5 ohm over the whole range. Midrange would be 100 dB sensitivity and minimum impedance of 4 ohm. Sounds like a good match...at least on paper.
I usually listen at 80-85 dB, and ocassionally get to 90 and maybe 95 rarely.

It looks like I would be meeting Atmasphere's 20% of 8W guideline at all time. Nice.
It's pretty well documented that sets do not measure well when it comes to distortion levels compared to other amp topologies. Yet many seem to find the sound uniquely appealing. So yes not an obvious thing it would seem. The fact that no two amp speaker combos sound exactly the same is a pretty good indicator that distortion is prevalent in various forms with most any technology to some extent. The proof in the end is the listening. Nothing is perfect.
Rebbi, I have 2 sets of audio nirvana speakers. The classic 8 and the 12', both with the basic magnets. the first boxes i had made at a car stero shop as they make boxes for cars anyway. they turned out great. the second boxes i had made by the guy david dicks recommends on his site, he sent them to me unfinished and precut for drivers and posts. they are great too. the cost of the 12inch drivers and boxes and stain etc was under 800 easily. i use an appj amp 3.5 wpc(220$) i got on amazon and rolled the tubes, genalex red lion. The sound is fantastic. i used a smaller cabinet size than i should have out of space concerns so i do miss some very deep bass output but it is so negligible it does not affect my listeneing pleasure. it is a nice treat to be able to select size and finish on your own speaker