best Punch.? I by no means have an awesome audio set up in my car i have some simple aftermarket speakers and an aftermarket cd player, i dont mind the highs of the music i play but i would like to get a good punch out of a sub, i know the basics of setting one up but im wondering what encasements pack the best punch and if there is a certain subwoofer that is best for this, im looking to spend under 75 for the sub alone. also i have a bazooka case but again i dont know what case is the one that give you that thumping punch instead of that low hummy sound, thnx!