My property line is about an extra 80 feet past the 86ft.. Without say 1000w amps say a 500w dual on the fronts and a mono 300-350 on a center (even though I would probally not use for stereo) Is this going to give me close to a loud enough level without damage and per say too much power for movies.
Never too much power for movies, unless you are outside as well, since you control the power entering the speakers with that little thing called volume control and in a closer listening levels a HT environment brings you just wouldn't have to turn the volume up as much as you do for outside listening.
I would certainly be entertaining seperate amps to run the M80s for the outside listening levels you desire and I would move the M80's onto the deck/patio if at all possible. I have run my M80s outside on my deck a few times and it's great.