I think the new line of speakers should have a distinct name of their own. A few ideas I have are below:

1. Axiom Aspect Series.
2. Axiom Expression Series.

I like the idea of taking the first letter of the series combined with 'M' to denote main, 'C' for center, and 'S' for surround. For example, the Axiom Aspect series would be something like:
Aspect AM-20 main
Aspect AC-10 center
Aspect AS-10 surround

How a speaker is denoted (M60, M22, etc.) isn't that significant,IMO. However, the series name is important as it should embody and convey the inspiration behind the design.