I should have put this in the first post, I had two p1 punch's in my room with the stereos stock 400w amp, you could hear it down the road from my house! I actually sold the p1's and my friend put them on a 1000w audiobahn amp and he says they dont bottom out and they hit like a sledge hammer, best part is I only paid $100 bucks for them new at crutchfield! And they are only rated at 600w both combined peak watt. The p2's and p3's are also good candidates, If you go with kicker I would go with sobo-laric's the comps are garbage and made of paper. Mtx's are awesome they pound pretty well. Check out crutchfield they have awesome prices. If you want loud beat your head in bass you want a ported box, if you want tight, clear, more defined bass you want a sealed box. There are SO many choices that you have, it all depends how much powa you want and how much you are willing to spend.
Josh