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The RSS subs are pretty good. The CSS SDX12 is unbelievable Love it! Very low distortion and high linearity. However, you are paying for the quality and will want to dsp a high pass (I have the passive radiator version). I have a 15″ Max-x (mx15-22) but haven’t made a box yet. For what it’s worth, Chris Perez, a engineer for Parts Express seems to really like them. For the price, it might be your best bet. I haven’t modeled the MX12-22 yet, so you may want to do that to make sure it’ll do waht you want it to in your sized box.