alright i've decided it is best to get an amp to make the sound better (until i get a sub or 2...or 3) so now i need to know the little things.........i want a good quality amp thats 4 channels. i THINK i need 100watts rms from every channel. my front 6 1/2 handle 75 rms and back 6x8 handle 100 rms. so would it hurt to just step up to 100rms from every channel? i dont want to damage the speakers by putting TOO much. now what brand amp.....any sort of specifics things i need? like new wire what gauge? brand? do i need a new alternator, battery, or any other accessory for the amp? also where should i mount the amp since its powering front and back speakers......under the seat? behind the back?