Ok i want to upgrade my speakers in my 92 hatchback and i want to put a component set upfront possibly kicker or alpine and also a rear set of 5x7 2 way speakers. I will need a 4 channel amp for those...correct? Then i want a sundown audio 8" sub. I believe the sub pushes around 500 watts rms. Any experiences with upgrading stereos on these cars and what works best for the money.