Ken,
Nice review.
Let me say right off....I KNOW, JohnK WILL approve your choice of receivers...AND the 16ga wires.
I almost got the M80's, back when I got my M60's......but, after talking to Alan on the phone, and the Yamaha A/V receiver thing, and the 4 ohm thing......well, it was the M60's for me..(no regrets).
I think your kind of "testing" is overall, the best way, and...MOST people will relate to it.
I'm not as sure, about the "ipod" as a source...(we all know that, source material is huge,... as to how good a system can sound).
However, I think the point is moot...the M80's would STILL have won out.
Larry