yeah i agree with just upgrading the whole system. A new headunit is definitely the place to start I have a pioneer single din that looks very nice and performs well. Just a headunit will make a large difference that most dont expect. Next you could get replacement speakers to allow you to listen to music crisper and even louder. The cherry on top is gettin a 4 channel amp to boost your speakers so they will be hella loud. I also got 2 twelve inch rockford fosgate subs and and amp for them to provide the bass when it is needed. And believe me when i say there is no shortage of bass