Soliloquy voices their speakers in part with Sim Audio amps(I got to visit the factory), so that would probably be as good as any place to start. I've got the 5.3s(driven by McCormack DNA-0.5 Rev. A) which are excellent--very detailed highs without glare, clear and full mids, plenty of punch in the bass(I had to plug the ports to even them out in my room which is a little smaller than yours and is square), and they disappear in the room and yield a large 3D soundstage. Best of luck.
Tim
Tim