Efficient speakers -- What was your journey from A to B to ?

Of the speakers you mention I have owned two:

Spatial Audio X5

97db. This speaker made magic with a Pass XA-25. Imaging was phenomenal, particularly the layered depth it produced. The negative was it produced a very narrow sweet-spot in my room, I think because of the unusual tweeter it uses.

Fyne F1-8

91db. Current speakers. These have concentric drivers and as a result imaging is excellent just about anywhere in the room. Imaging is not quite a magical as the X5, but still excellent with AGD monoblocks. This is a very well balanced speaker. It also has a presence control that is very effective in making adjustments for personal taste in the 2-5k range. I use it with a subwoofer.

I also recommend you add the Caladan from Clayton Shaw Acoustic Lab to your list. 93db, open baffle design with a silk dome tweeter. I heard them at Capital AudioFest and ordered a pair - waiting for delivery. Very reasonably priced, extremely good sound.

I've owned a few of these over the years, 

- Audio Note ANE:  great midrange decent bass if set up right but IMO lacking in bass definition if the room is not perfect for them. not as efficient as claimed, you need min 20-30wpc to get the to sing. 

Fyne: Tannoy engineers making Tannoy nock offs but I've heard them and they sound great. on my list to look at one day.

Klipsch: heresy 3, LaScala ( full crites upgrades), Cornwall 2, they do dynamics like no other, the LS's are special in the midrange. 

legacy i want to try them one day.

 
Living Voice: I had a set of Avatars earlier ones, some of the most musical speakers i've ever owned, still regret selling them and probably will own a set again. 

Omega SAM's: best imagine I've ever heard but lacking in some areas they have a bit of the typical honking sound that some full rangers have. 

Pure Audio Project tri 15 friend has them very nice but maybe a bit over priced. 

Tannoy Monitor Gold 15's:  interesting I'd like to hear the newer ones but if they are in the wrong cabinet they sound horrid. 
 

My brother has Klipsch Chorus which are in between Fortes and Cornwalls. I took my Quicksilver mid monos to his place and we both thought it was a great match. I believe the Chorus are 102db sensitive. This was in comparison to his Parasound amp,but I don't know which model. VPI  Classic turntable, Demon CD player, Straightwire cabling.I have Zu Omen Defs which I know you aren't interested in but I am hooked on high efficiency speakers.

Don’t see Devore O series on the list but hoping to hear some myself - rarely come up used.  Just a comment on Audio Note - they want to be in the corner - not sure that would work in your current space but you mention you are moving to another room.

im on my first stop on the high efficiency journey - agree with the comment about music sounding effortless.  I’m using Omega CAM in a smallish room with a single sub.  Don’t miss the tweeter at all - both because I sit in a fixed sweet spot and also as I’m 68 and my hearing drops off after 12k… please report back on where you end up

DIY is a really great route for this, as you can get really high quality drivers vs manufacturer made speaker systems. Most high efficiency solutions will use a full range driver and a bi-amp solution for the bass drivers. DSPing the bass drivers with a high quality DSP is almost always better than relying on an internal or external analog crossover because it also addresses issues in your room.

I’ve tried a number of high efficiency speakers, and my personal favorites were custom Oris 200 horns with AER BD3 drivers. AER drivers are not cheap, but they are outright fantastic. Incredibly sensitive, typically over 100dB, and no sizzle or fatigue like Lowthers.

Another option, also quite pricey, are Voxativ field coil drivers. I have a friend who uses those with custom bass cabs, and they are unparalleled in terms of presence and as fatigue free as AER.

I know you mentioned that you won’t spend tens of thousands, and that likely puts the Voxativ out of your budget, but you may come across a nice pair of vintage AER for a great price.