The Axiom M80's are pretty efficient speakers. Those monoblocks are nice but they might be overkill for your system.
My suggestion is to look at a nice integrated amp instead, especially one with bass management. If you're set on the monoblocks then I would look for a pre-amp with bass management. What I mean by that is an integrated/pre-amp with a built in crossover to direct the bass below 60 or 80 hz away from the main speakers and to the sub instead.
There are a couple of advantages to this; first, by allowing the sub to take care of the low-end exclusively you're decreasing the load significantly on your amplifiers and allowing your speakers to focus more on producing quality mid-bass. Second, the Axiom M80's have a -3db point of 34hz, if you run them full-range along with the sub you're going to have a LOT of bass. That may be the sound you are looking for, but if you find that it's too much bass, without bass management your only options are to turn down the bass on your integrated/pre-amp, or to lower your crossover or gain setting on your sub. Either way, I think you will be able to achieve better results and a flatter frequency response with some bass management.