Sheep - The Axioms are not necessairly "better" than the Energies. The 2.4i's are somewhat more laid back in the upper mids and treble, where the M80's are more neutral.
My guess is if you did a DBT between them, there would be those who pick the 2.4i's, and those who picked the M80's.
But - when you look at the price of an M80 based theater package, it is a tremendous bargain.