For those interested I decided to go for the Luxman amps(2) In regards to the Mcintosh I found them to be almost painfully bright sounding in the higher frequencies. I spoke to a dealer who told me his store has had both amps hooked up to the magico M2 and in his opinion the Luxman magico combination was superior. I guess I will find out. In regards to crusty coot concerns switching the M900U into mono mode your opinion is appreciated. I have done all I can short of demoing the Luxman, which is for me is impractical because I live in Alaska. For what it is worth Jay of You Tube's Jays audio lab indicated with some stereo amps switching from stereo to mono was disappointing but that was not the case for the M900U. Again thanks for your input.
Guy T.
Guy T.