Dark Gray Metallic is easy to clean and doesn't show filth as quickly as other colors. I've had silver vehicles in the past and paint chips, dings, and scratches are obvious. Had an 03 Civic Si HB and it was pretty bad. My black 05 STI isn't nearly as bad, but dirt shows on it a lot worse than silver.
Personally, I'd go with either Dark Gray Metallic or World Rally Blue (classic, looks fantastic with gold wheels). Had an 07 Civic Si in blue and it wasn't nearly as bad as silver to keep looking clean.
Silver's a bitch to keep clean and invisible to Jeep drivers.
