A company I worked for did an Experiment on how vehicle color effects interior temperature. It was discovered that the difference in interior heat absorption based on vehicle color is negligible.
After leaving a White, Black, Red, Blue and Tan Chevrolet Malibu sitting in the sun on tarmac in northern Phoenix on a 112 degree July day for 7 hours, the temperatures inside of the cars varied by a combined 0.7 degrees Fahrenheit. The black car was actually 0.2 degrees cooler than the white car.
The surface temperature of the paint, itself, however, varied greatly. There is a perception that a dark car gets hotter on hot days than a light colored car, however, it has been scientifically, and empirically proven that is simply not the case.
If interior temperature is really that much of a concern, put one of those reflective shades in your windsheild.
Exterior color, however, does have several effects on other criteria. Perceived value of the vehicle, Attention factor, masking of dirt/scratches, etc.
In truth, it doesn't really matter what color your vehicle is. The best color is the one you like!:victory: