High End Car Subwoofers Component Vs 6x9 Questions.?

Component vs 6x9 questions.? - high end car subwoofers

I'm going to run higher end components in the front doors / dash of my new Altima. I wonder whether I should run or a 6x9 series of other elements of the back? In addition, they will all be driven by 100 watts RMS a piece. Any suggestions would be great. I run since my subwoofer car is working and the family car, hopefully mid-bass is strong enough.
I am studying the possibility of JL Audio, MB Quart, or ... Please I need your suggestions!