if youre willing to spend a lil more, memphis m-classes (with their sexy carbon fiber goodness) are very good for the price. I have 2 of the 2005 models, and i have had nothing to complain about for almost a year of use. I was overdriving them by almost twice what they were rated for too, so they must be pretty tough.
EDIT: the reason i took em out was cuz they wont fit in my current vehicle, so i got a single 12" type-X