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Perhaps surprisingly, white hides dirt pretty well. Not dirty-snow type dirt but your average between washes dirt. And white looks great on the GT/CS, IMO.
silver will look the cleanest all the time, but in my opinion its a boring color. If you're not going to go with black, I would go with the race red.. that color is sick
Between red and silver, I prefer silver. Red is a very high profile color car, so the cops will see you coming down the road miles away. Water spots (from rain) and dirt do show up on silver quite a bit. Just FYI, especially if you park under trees. Anyhow, no matter the car color, being parked outside will just get dirty. Silver is highly rewarding when nice, cleaned and shined up.
I have a black GT/CS and love it. It does have the stripe, its just flat black so it's very subtle. That being said, it IS a chore to keep it clean but no color looks better IMHO when it's clean. If black was out I would get either white or the red. Both look fantastic wth the CS package. I wouldn't get silver as I personally dislike silver cars. It's really something you need to decide for yourself though.