So I am completely new at all of this car audio stuff. I have a 2003 Toyota Highlander with a Pioneer AVIC-Z1 head unit. Also, the speakers in my car are JBL, if that matters. I'm interested in buying some subs and an amp for the back of my car. I've heard Alpine Type-R's are good? I listen to all types of music but mostly hip hop. I am open to any and all suggestions so don't be afraid to type what you think. My budget is $500 but I'm not afraid to go over a hundred dollars or so if it will make my car sound better. I also would rather have a setup that gives me better sound quality than over-the-top bass.Thanks all!