Congrats on the M3.
Those were my beginning with Axiom, fantastic low end for 2 channel full rangers or all rounder's.

I have never heard any center of Axioms other than my V.P.160 V.4.
After purchasing my M3s and M22s 5.1 days. Was trolling through many forums to "help" my decision making. Was using a Klipsch C20 the timbre was awful very shrill didn't complement Axiom for me. Found it annoying center stood out to much.

Kept coming to the 160s style as being best woofer arrangement for off axis performance vs others. The 160 was also made by Axiom due to customer demand for this detail.

So I decided to give the 160 a shot B stock Axiom has very high quality control if you get a good rating on a product, the blemish is hard to find.

Since then have upgraded the rest of my setup to M80s,E.P.500 ADA1250 etc.

Take your time with steps it's fun.

Cheers Brendan