Just completed the system. Will provide feedback soon.
Owing to the amount already spent, the only upgrades in the system could be replacing the nterconnect and speaker cables with Kharma Grand Reference cables and that will be the end. I work for a living and have to stop somewhere.
You need to upgrade your wall sockets, buy a turntable and great cartridge, and what about the absorber thingys for under all this stuff to stop vibrations, speaker filters........ you are just getting started. Really you have a great set-up there. Congrats!