Screw the cig lighter idea.

Buy some extra wire, cut off the plug end on your existing wiring, lengthen the wires, hide the wiring in your headliner and down the passenger side a-pillar into the dash Either tap from a switch power source from the fuse box, or used the switched source from your acc power drop and then finally ground the other end. Simple as that and no clutter, nice and clean. Thats how I do it on my cars...