Beautiful room, Dave. I see what you were referring to reg the wood stove in the corner there. The M22 will give you more placement options obviously, vs the in-cabinet M60. When you spoke of putting the M60 in-cabinet in the wall unit, you must then be considering modifying your wall unit, correct? In this case, I would contact Axiom, and ask them what the dimensional requirements are (behind the baffle) of the M60 in-cabs. You might consider the W-22s in this case, as well.
The cabinets of the M22's are actually fairly deep at 19-20 inches and are rear ported so they need to be set up a few inches off the wall, if you were considering placing them on/in the wall unit. The brackets would work on the outside of the wall unit as long as you feel the speakers would be far enough away from the stove.
I'm thinking the M22's might work the best for you here, and they are, by all accounts, a wonderfull speaker, but the M60s could also work well if you modify the wall unit accordingly.
I know, I'm sitting on the fence.....
