Based on personal experience, you're headed down a long road of "what I thought would be enough just isn't cutting it, I need more" in terms of audio. If you're coming to the meet tonight I know that @
SirBrass and I both have our audio set up pretty much done other than the two rear speakers behind the front driver and passenger seats. You should come listen to a couple of set ups to determine what would really suit your needs. At the end of the day, it would be more cost efficient to know exactly what you want and get it done the first time rather than buying something and then selling it to buy something else you'd be happier with.