for the power for the lilli (someone confirm this) you can use any 12V+ power... like from the cig lighter.
"Visual" you will need to get a VGA extension cable to get Video from your comp. to lilli
and if you're running the wires for VGA already might as well run some for the DVD... they have IDE to USB adapters out there for cheap.
I personally favor the Opus...
Hope this helps