OP,
Sonus Faber, Audio Research, and Transparent interconnects are a known synergistic combination. I got there by stumbling upward over fifty years of pursuing the high end. My most consistent preamp was Audio Research. The recommendation of a Ref 80 amp is good… I currently have REF 160m mono blocks and a Reference 160m… driving my Sonus Faber Amati Traditional in triode mode… so 70 wpc. I occasionally switch out of the triode mode to double the wattage… while the difference in sound is not obvious, I switch back in a couple minutes.
But order of business is their preamps. The ARC preamps are world class, highly detailed, but warm and organic… not tubie, but with great midrange bloom. The amazing thing is the musicality with preservation of details and soundstage. I really recommend the Reference series 5 and higher. I owned a Ref 5SE for many years. I would look on line for used ARC preamps.