We are Ushers dealer and have found the larger BE speakers really perform best with at least 100 watts of power. We have had equally good results with tubes (like the Cary 120s) and solid state (like the Gamut DI-150 and Plinius 301). While you can run the BE-10/20 with smaller amps, we have found that the speakers dynamics can be limited. We have not tried the Ushers with NuForce amps. I think my favorite combo to date is the Cary SLP-05 preamp and Plinius SB-301. In terms of cables, the speakers seem to be less finicky than other speakers, as long as they are quality cables.
-- Jeff
-- Jeff