Z, welcome. Your McIntosh equipment is excellent and will power any speakers, certainly including the M80s, with transparent ease. There's no "match" involved. That term implies that the amplifier would have some sort of sonic coloration that would neutralize an opposite coloration in the speakers. Nothing of the sort exists with McIntosh.
If "most people" recommend "vintage" speakers, they're out of touch with the realities of modern audio technology. Speakers aren't perfect and never will be, but there've been great advances over the past 20-30 years, and the process continues today.
