Which subs should i buy?

Most people will say kicker, but kicker IS good if you want a lot of bass but kickers are NOT clear and are just loud and disorted. the cleanest clearest best one you listed is the alpine typr r. I LOVE alpine and that amp would rock your car amazingly and clearly. The MTX us a good system but its nto worth that much, the polk is good but not as good as the alpine. that one alpine with 1000watts is probaly louder deeper and clearer then both the polks together. so to sum it up the MTX isnt worth it. the polk's arent the best deal but are decent. the kickers are the loudest but are distorted and not clear. the alpine is the clearest and deepest and hits pretty hard too and youll never find a deal that good for that cheap again.