I bought these (
http://a.co/eUlr9AY) for my boat, which also uses a 12v system, and they work FANTASTIC.
$27, Amazon Prime, 16.4 feet long, sticky adhesive back (which I reinforced with a little extra glue), remote control to power on and change colors, and the power supply is easy to wire to a 12v system. Very little draw, and they can easily be connected together to get long strips of lights.
Here's what they looked like aboard:
and another: