Thanks for the replies everyone.

bridgman: The plan is to keep the floorplan open, so we won't be putting anything between the great room and kitchen.

Look like I'll be following exlabdriver's suggestion and just going with the rear mounting. I plan on picking up a new Yamaha receiver anyways so I'll just let the YPAO calibrate things.

It's been a long while since I've looked at the Axiom website and those inwall M22's look SOOOOO tempting!! I wonder what the trade up value of my cabinet m22's are worth!