If you don't care about looks, get the SVS. SVS also makes a cubic sub now if you're worried about an ugly water heater looking cylinder in your living room. SVS makes better products than Athena and HSU (for the price).

If you want to stick with Axiom, get the EP175 or 350. People ommit their subs too quickly. They're really, really good subs, and they look good, too. Their performance ratings are little underestimated. When you hear them, they sound great. The EP350 uses the same kind of amp as SVS, that is, a BASH amp. It's canadian, too!