I owned the Arros for a few years and am confident that the Classe would provide sufficient power. While I've never heard the Classe, 100 watts should be good for your stated needs. In my experience the Arros sounded better with tubes than solid state, so perhaps you could look into a Unison Unico or Vincent Audio integrated as "clean looking" solid state/tube hybrid options (as for solid state, I've heard that Plinius and Simaudio integrateds both work well with Arros). I really liked the the sound of EL34s with the Arros, so consider a Jolida 302RC, Rogue Cronus, or VTL IT-85 as well.