Hey all, I own a Mazda3 (s version) and have decided I need a system in it. I have about $600 to spend and would like to see if anyone could suggest a decent system for me? I am unsure what parts to purchase so if someone could help me out itd be great. I am looking to purchase a head unit with an aux input, sub(s?), amp, wiring, a pair of speakers, and install (my friend said he could install all but the amp, but it would be preferred to have a reputable store install it all if possible). Also, I dont need a box since my friend is a carpenter and can build one for me.