I drive a pair of Sonus Faber Elipsa SEs with a Ref 110. It is an excellent match.
Generally they are known to work very well together. Audio Research is owned by the same parent company as Sonus Faber. They are demoed at shows together a lot and Audio Research uses Sonus Faber speakers in their main listening room.
You might want to browse the AudioAficionado.org board. There are a lot of people pairing Audio Research with Sonus Faber. They have a special section for both a Sonus Faber and Audio Research.