The color that LOOKS best is black.. but most difficult to maintain. When you don't have porch or garage, forget it.
The color that is EASIEST TO MAINTAIN is white, but usually it is a rent-a-car color choice.
The color that has the LONGEST LIFE is silver! Never looks odd or out of place, specially in family cars. That's the color for you!
In silver, there are two options:
1. Alabaster Silver (Light silver)
2. Polished Metal (Dark silver)
So, my final recommendation is:
GO FOR ALABASTER SILVER METALLIC