It went like this for me:
I was a B&W fan for many years and while I was awaiting delivery of the 805 N back in 98 or so, I was loaned a pair of Concertos from this particular salon. Suffice it to say, I never went to pick up the 805s as from that point in time, I was over B&W, so it went sort of like this:
805M>SF Concertos > add REL Storm II > Replace Concertos with Signums > sell set for Electa Amator IIs > money crunch, sell EAs and get Grand Piano's.
Some where around the time I had the Signums, I heard a pair of Verity Audio speakers for the first time. They became the "grail" speaker for me.
SF GPs > Dali Helicon 400 (very short time) > Reference 3A De Cappo i > Devore Fidelity Super 8s >> then the Grail: Verity Audio Parsifal Ovations...
All that to say, I think, IMO, the natural progression for one that wants to keep that something special of the Sonus Faber line, but are looking for a change in speakers, try Devore Fidelity lime and the Super 8s specifically as are fantastic speakers, on the other hand, for a wonderful and fairly large step forward go for the Parisifal Ovations and for a little less cash, give the Fidelios a listen.
Although, I toy with upgrading to the Sarastos II, I suspect I will be with the Verity Audio line till the sun sets on my audio-phile life...
Enjoy the journey!