Fitting your criteria, I really liked the Moon W5 in sound, build quality, and bench performance when I had one on loan. The Bryston 3BSST is also a nice amp.
The McIntosh MC7200 might also work, but their input impedances are usually like 22k. BTW it's a high current amp with a low output impedance, which can't be inferred from it's specs that don't "double down". It's continuous power output into lower impedances is limited by the power supply . . . but that's not really a criticism, as there's still a ton of power available, and lots of dynamic headroom.