I have a Pioneer AVIC-D1 head unit and have decided to upgrade the rest of my stereo system. My budget is $2,500 installed. I will do a subwoofer with fiberglass enclosure in the right rear well with an amp for the subwoofer in the left rear well. Should I also consider replacing the stock speakers and stock amp? The stock system is not DSP. Very interested in specific components, brands, etc. Any suggestions would be appreciated. FYI - my like my music crisp and detailed.