Hopefully some of the audio/video gurus will jump on to help with that part. As for power though, I would do exactly what you mentioned. I have bench seats and it has the power in there, so i've tapped that for my rechargeable mag lite. I'm guessing that you have the captains chairs. Since you don't have the DVD system, the plug for the system is still under the center console. You can always find the switched power for that and tap directly to that so it's powered off a keyed source.