<font color='#000000'>Definitely ditch the Kenwood high-end. I would also suggest to ditch the Rockford subs, and while we are at it, the amps too.
A good dealer will have the ability to build a quality MDF sub box. They also would not recommend a pre-fab box with the amount of money you will be spending!
JL Audio makes the best sounding subs. They also make high quality amps!
MB Quart is my first pick for high-end. Dynaudio & Focal are also great choices.
Optima sealed battery!
P.S. Kenwood speakers are the best sounding when using radio power. But, with the kind of system you are wanting, they will be the weakest point!</font>