I'd talk to Rockport, ask them what they found to work well, I'd also ask what they found didn't work as well.. At the "cost is no object" level it all becomes differences, and what matches best with your speakers, room, and your ears. Certainly ARC, Lamm, Ayon, Halcro, Rowland, Krell, Ayre, Boulder, CJ, Spectral, VTL, all would work fine.. but one or two will be the match made in heaven for you. At the price point you're talking about buying by the label is a bad idea.