Mojo, within the first 5 minutes of listening to the M5's I knew the right decision had been made. All of my apprehension about giving up the M50's was gone. Like you said the detail, prescence, clarity, soundstage, everything about them is better. And they play loud perfectly.
I do still find vocals collapsing to the left speaker due to my seating position but not quite as drastically. Now that the M50'S are gone the decorator is talking about putting a small chair in that room. When that happens I'll be able to move it to the sweet spot when I'm just sitting listening.
I appreciate all of your assistance and advice with this move.