If EVER I have seen a vehicle begging for more bright colors, this is it. I did a little poor photoshop work, they look great.
But, the jump in price? Doesn't it have to be painted anyway? I do see it if its only one. The Pearl paint probably costs more, so add some for that if necessary. I'm not saying any color should be an option, but I saw a pearl yellow/orange (I have some color vision issues) Toyota Supra. Geez, would this car look great with that. Does any other Car company has to kahunas to make a pearl Green. Go to the Mall. It is a Sea of black, white, red, and gray. My current car (veloster) color is some shade between orange/yellow. In that Mall, guess what. There is 1 yellow car out there most of the time. I don't need a honk to find it.
On top of that, allow a few schemes even more creative. Maybe have a contest of user submitted Designs. Obviously, charge more for that.