I have a 1993 Ford Ranger Extended cab with 4 6x9 Pioneer 3 way speakers. I was looking to add some bass to my system. I have around $600 to spend on a sub,an amp, the supplies for a box that I will build myself, and instalation(wiring). I will install the subwoofer myself. I listen to mainly rap and sometimes I listen to a little rock. I was looking at only getting one sub to put in the cab of my truck. I would like good spl and sq. What system would you guys suggest.