SF Guarneri with ARC Reference 110-CD7-3 ?

They are nice monitor speakers, as are the Signums, but I would not buy Sonus Fabers in the U.S., new or used, because Sumiko, the U.S. distributor, will only provide service to the original owner. This makes it a lot harder to sell them if you buy new, and makes any used purchase foolish (buying monitor speakers used is always risky because people tend to overdrive them - buying SF monitors used would be nuts).

Onemug: I stand corrected - to get service, you have to prove that the speaker was purchased from an authorized U.S. dealer.