hello; I currently have Focal Sopra 2; I have a PS Audio Directstream (had the A21 Halo/JC2 combo, BHK and also LS27 so similar hardware experience as you) and currently run a luxman m900u amp (c900u preamp inbound); Previous to the Sopra 2’s I had Dynaudio Contour 60s; The Lux has a very "alive" and very transparent presence about it;
I personally do not like the synergy with the Sopra 2 and will be moving on from the Focals; With the Contour 60’s the tone and overall sound quality was far superior to my ears; I did a ton of research about the Gryphon Diablo 300 (was very close to acquiring) and, on paper, it seems the Focal synergy would be better, or perhaps the Luxman 590 AXii Class A integrated.
One thing I noted with the Sopra 2’s; I was surprised to find them about as efficient as my DYn 60’s; on paper that should not have been, but it’s what i’m experiencing. It actually seems that they like MORE power than the 60’s; go figure.
I would include the class A stuff from Pass Labs in your hunt; I had an XA30.5 and it was a wonderful amp on the Dyn 60’s. a velvety beautiful mid-range excellent dimensional aspects, sweet treble, that I think would have been a better match on the Sopra 2s; With the DSD/BHK and a Pass XA30.8 I think there is potentially excellent synergy;
You did mention 260.8 monoblocks, and they have about 35watts in class A, so that might be better...you already have monos, so you probably have stands too :)
I have only read this, and so it’s mere conjecture, but Naim might be too thin with the Sopra 2’s.
Another up and comer to check out would be the Hegel H590. Reported to be very powerful and smooth, yet highly resolving.
Please describe your acoustic and music characteristics; Room dimensions, listening position, spacing, damping (bare walls/floor heavy carpet...), genre of music, preferred listening volume...etc.
Also, what cables are you using, IC's, speakers, power?
Have fun!