I have 2 10's in the back hatches filled with dacron (you can see in pic). they are running in series to a 600w kenwood 2 ch amp, then I have 2 12's in a ported box ran by a 800 JL audio 2 channel mono bridged. My front 4 speaks are eclipse ran by a 800w 4 ch kenwood amp. I have a kenwood 7 inch dvd/nav up front and a 9 inch drop down eclipse for the kiddos in the back seat with 4 infrared headsets.
I can play a DVD to the back seats (thru head phones), then a different movie thru the ipod (front speakers) and nav flashes on the right 1/3 of the front screen when it's time to turn, all the while my blue tooth sync'd with my iphone.