I need extensive help with car audio?

i have the same car with a jvc deck that has an auxilary input so i can play my zune through it. i also have 2 boston acoustic 6x9s in the back, kinda pricy but very good speakers, the 6x9s have the 300 watt dual amp from walmart hooked to them. i also have a quantum audio 15 sub in the back with a rockford forsgate prime 500watt amp hooked to it. if u dont really know anything about systems, maybe u should just get some better 6x9s and some new door speakers as well as a new radio because it does make a difference n sound, with and aux input so u can use ur ipod. also u may want to mess around with the equilizer on ur ipod if it has it, so it will sound better. good luck cant really tell u anything else but to make some friends who know about car audio.