I suggest an Anthem AVM-60. I think it is $3K new and can sometimes be found here used. Importantly, it has ARC built in, which is fairly easy to use, and can make a dramatic improvement in SQ especially in rooms that are not acoustically treated. I don't know how it will match with your amp, but I run mine with an Oppo 205 as a source. It provides a terrific home theater experience in a very large room.
Happy hunting
Al
Happy hunting
Al