Welcome to Axiom! I think the Epic Grand Master
would be the perfect pick for your size room and movie/music preferences. The Grand Master plays a little louder and lower than the Master, which will complement your action/adventure movies very well.
In terms of placement, I would suggest you look to our Quadpole Surround Stands (the QSS8 for this system, located in the 'all products' section of the site). These specially-designed stands allow the bottom woofer to breathe freely, so you get the full quadpolar experience.
Having said that, the picture would also help us help you.
The M22s, which are the front channels, have recently been reviewed by John Potis of the SoundStage! network. They're being measured at the NRC this week, and should be up on www.soundstage.com very shortly.