I truly believe that the Hypex NCore 400 DIY monoblocks are the best SS amps under $10k. No, I haven't heard them all. LOL If you dont want to build them then there are people that will build them for you for a little more money. They sound startlingly different than most amps because they are so clean and clear. The have a fantastic sound stage. With your efficiency they should be a perfect fit. I do have one caveat. Since they are so neutral, you will want to make sure you pair it with mostly warm equipment.
Bob
Bob