But the system is down.

I liked the siren. It was like ...

JP, we can't hear you through the computer.

You guys are silly.

Damn! That means we can't all notify Mark's notify posts. I feel like I'm in an episode of Pinky and the Brain.

For the OP,

Try sending a PM to onn on this site, he has 5 M80s in his system.

Thanks. I've decided the M80 is the right speaker.
There no doubt in my mind I will have an actual HT twice the size of my current one in my next home.
I've also decided to use my extra channels to bi-amp them. I will be giving up all but 5.1 but for my current needs this makes the most sense.

There's really no benefit in using the bi-amping provided by receivers these days. In fact, there's probably no benefit from bi-amping unless you were to remove the crossovers in the speakers and purchase an active external crossover as well as separate amps.