I have the dialogue Premium HP integrated, and what I did was to buy 2 Evo 300 poweramps and run them as mono amps with a Herron Audio VTSP-2 preamp
which is the best of both worlds. And the Primaluna integrated I put into my office system.
So if I was in your situation I would get 2 PL Evo400 power amps and run them as mono amps along with the preamp of your choice and sell the Evo400 integrated
So if I was in your situation I would get 2 PL Evo400 power amps and run them as mono amps along with the preamp of your choice and sell the Evo400 integrated