Money is not always there for me too, which is why I'm using my old stuff I've listed before. I may just put all the units under the rear seats and make an enclosure for the 2 10" JL's. I like to make it look stealth and I will be using the rear often enough so I'll make the box removeable or maybe along the rear sides. Rear quater panels might be a good spot too.
At this point in time I don't see myself going through rivers yet.
A few bazooka tubes would be nice too but I'll use up what I have first. As I do the work I'll take before and after pics.