Hi Cork,
Spend as much as you can on power; you will never regret it.
You can have the same rated power output from different brands but the true power can be quite different from one to the other. That is why brands like NAD, Cambridge, Rotel and Harmon Kardon even when they show specs with less power the reality is that they are more powerful than most brands showing much more power.
The Axiom M22 can be pushed so don't be afraid to feed them with a lot of power.

jc