I've looked after light grey (MB and Lexus), Ivory (Jaguar), Tan (MB and Range Rover) and black (Lexus, Nissan x2 and MB) in recent years and I haven't had any trouble with any. Even the Ivory when my old man wore jeans on it. Gentle cleaning and conditioning regularly and you'll have no issues.
Go for the frost. It's lovely. My pick would be Night Blue with Frost - just like the one sold recently!