And you otta know Mel
michaeld has the resistors on his M80s, IIRC, he liked them much better this way.
Troy as you have mentioned the Studio 100's are a better all around speaker than the M80's, IMO, but not $1000 or more worth. This is where you have to compromise, unless you are willing to spend BIG bucks to get better than the M80s, you have to buy the M80s.
I did notice the M80s sound even better and that much closer to the Studio 100s with Axiom's amp running them, so maybe look to those after market amps once you have the M80s again.