Welcome
Most Axiom customers are justifiably enthusiastic about the quadpolar surrounds (the QS series). Recommend you stretch your budget to get those instead of the M3 for the surrounds. They are very immersive.
That's a pretty big room; you don't say how loud you like it. That might be the only consideration relative to getting a floorstander.
The M80 posse is going to come in and make you feel like you are incomplete if you don't get those.
I have the 60's and think they are wonderful. I still own some Polk speakers (RS3000 sub/sat) and think the Axioms are clearly "better" in my room.
If you can find the money and space, the VP180 is getting rave reviews.
