Its real easy to overthink things in audio....well pretty much any project area for that matter.
To keep it simple: stick with good components, don't try and re-create the wheel and you should be good. At the end of the day you are installing a stereo in a small tin can
Plus its easy to tweak things here and there in these trucks.
Unless you are an audiophile with a trained ear most good gear will yield the sound you are looking for and just like horsepower your tastes will change as you go along.