How about N2, N3, N22, etc.
N is the letter after M anyway.
Lets people know the designs are related.

I also like the earlier suggestion of the "no compromise series"

Its 2005, I think Axiom should drop the Millenia bit from the new product's name.

I asked my mum if she could think of a name.
Long shot my entry is the" "Narsinh" series:
A few Hindus would know what this refers to.
There's an ancient story about Lord Vishnu emerging from a
pillar (not a wall unfortunately)
in the form of Narsinh, in order to save one of
his devotees.