Cain and Cain, Klispch Heritage, McIntosh, Parasound, Anthem, Paradigm, Magnepan, Innersound, Denon, Onkyo, Clearaudio, Pro-ject, VPI, Marantz, Velodyne, Vandersteen, Anthony Gallo Acoustics, Quad, McCormack, Musical Fidelity, Bryston.
Best stuff you can find at most price points. Stay away from super, super high end and have some eclectic things. Sell at least 2 super well known lines, Klipsch and Paradigm, to get people in who will be blown away by things they have never seen if not into audio, ie Magnepan and Vandersteen.
Good Luck!!