Arabba with Diamond tweeter cost 33K Euro in EU and $50K in USA. It is in completely different class from any Sonus Faber speaker, save Stradivari. But, big room and amp are a must...
Cassiano Diamond is excellent speaker as well but, I would personally choose new Avalon Indra over it.
There are other excellent candidates in Cassiano price range like new Gryphon Atlantis or Escalante Fremont to give you just few examples...
BTW, old Guarneri Homage is not all rounder at all IMHO...
Just one last thing-all speakers mentioned above are floorstanders(some even big floorstanders). Arabba, Atlantis and Fremont demand room bigger then 30m2. Cassiano and Indra at least 24m2. Keep that in mind as well...