As for question one, If you want to just buy a boxed sub solution, then i'd definitely go with a JL Audio. They have 30 or so enclosures that come complete with subs, and they are well regarded as one of the best sub makers in the biz. Can't go wrong with an enclosure designed by the company that made the sub. I had a ProWedge CS110-W3 in my Civic and it was amazing.