for the longest time i have been contemplating on my options for a full audio system for my civic. i recently had the pioneer avic d3 h/u put in. the sound from it is very good. there are many eq presets and such where i can tune my music to the way i like. i dont think that i want to do a whole new system now, but rather sound deaden my doors and maybe get a small multi-channel amp for my stock speakers. my question is, is there a more perferred sound deadening brand that i should go for? and should i get the spray on, paint on, or the thick metal kind? and how much should i get?