Used or demo Portal Panache would be a superb choice if you only need a line stage and don't require a remote. To drive two sets of speakers you might need a switching box. I'd recommend a used Bryston if you can find one. Maybe a bit more investment, but another great option if you can find it would be a used Unico Unison SE, or with less power, but also an outstanding choice, the standard Unico Unison. Not sure if they have multiple speaker options.
Marco
Marco