I can't speak for the Arcam or Marantz, but I know that NAD receivers have the dynamics and punch that I desire. Now my only personal experience is with my 2004 flagship T773 which is a 52+ pounds beast that has a fantastic amp section. Even though I used it mainly as a pre/pro with an outboard amp, I am currently using it in a dedicated 2-channel setup and it handles the task wonderfully.
Bill
Bill