Luc,
How big is your room? That is one thing to consider.
Most notably, you'll notice the ability to play louder cleaner, and you'll hear a lot more "fuller" upper bass straight from the speaker.
For movies, you'll get a much bigger sound.
According to Alan, the M22's and a sub sound VERY similar to the M80's. I think I heard him mention in an article or a post that in his home/test room he has m22's and m80's. At one point he didn't know whether he was listening to the M22's or the M80's.
I would say if you have the money, like to listen loud, and want to have beautiful big towers, then go for it.
