Alright.. Well.. Here's my plan.. I have an Ae86 and I'm planning on rigging it up good

I crave Loud music with bass : )
I'm going to take out the back seat and build in a sealed box

But I'm having troubles deciding on what I should put it in. As in exactly how many speakers I want, where to position them, and what kind. I can't afford top of the line, but I want the best bang for the buck kinda deal. Other than installing the subs in the back, I was thinking dash tweeters and just use factory speaker setup, but replace the speakers of course :P Eeee.. I've never had a car worth doing anything to so it's kinda exciting :P My last two cars were a Plymouth Sundance and a Pontiac 6000 :P LoL.. And they both died on me :P so now I'm down to my AE86 and my Cirrus :P
But if anyone has any ideas for this and as well as brands/models to go with I'd appreciate it