I've always steered clear of silver cars; if you're unfortunate enough to need any bodywork repairs, I've been told by a couple of people in the car body repair trade that it's one of the most difficult colours to get a good colour match
I'm pretty anal and OCD about the appearance of my car, and I wouldn't be able to live with a 2-tone paint job. I must admit though that silver is one of the easiest colours to maintain, and shows the dirt much less than dark colours.