Marsh A400S or McCormack DNA 225 or Plinius 8200

I have a pair of B&W CDM9NT speakers and am looking to upgrade the power source. The contenders are the Marsh A400S amp, the McCormack DNA225 amp, or the new Plinius 8200mk.II Integrated amp. Any feedback?
I heard them all of the above, then chose Pass X. so for me it was "none of the above."
Try to get a MINT condition used McCormack DNA-1 and you will be very happy with it. It is the best value for the money at less than $1000.