To throw a different opinion in the mix -
I am not a fan of the Sonus Faber sound. I have had extensive auditions with: GPH, original GP, Concertos, Concertinos, Cremonas, Cremona auditors. All different electronics, tubes and ss. Though there are certainly qualitative difference between these models, they all share a similar house sound.
That house sound is VERY warm, and exhibits this characteristic that I will call the "Sonus Faber Glow". This glow makes acoustic instruments and some well recorded voices sound holographic, textured, and eerily "in the room". I will admit in some contexts it is an entertaining characteristic. However, I have found that on less well recorded music, electronic music, rock music with drive, large orchestral music - the soundstage collapses, and the glow kills the tonal balance of the music.
So - I would say that before purchasing a sonus faber product, an audition is necessarily to determine what your opinin of the "glow" is. It certainly makes Diana Krall and other "audiophile test discs" sound great, but Radiohead on SF speakers will sound completely unengaging, and essentially broken.
I personally prefer a much more dynamic and "clean" sound, without the addition of the thick Sonus Faber colorations. Wilson speakers do this for me (the Sophia at ~11k is amazing) as well as the Dynaudio Contour series of speakers.