Some of the statements about the sound of each amp mentioned above my post are generally true. This is the best advice I have read. Pick up an ARC D-79A or D-79B. Even used, a lot of people think it was the very best amp ARC ever produced. BUT you have to have them modified. We recently upgraded a D-79B and were amazed at how it sounded once upgraded. BUT it is a big beast! LOL.
I don't see your source so I am thinking you are getting your sound quality from the source and not as much from the amps but I am not there to help you evaluate that part of your sound.
Happy Listening.