What are the plates your planning to get? Are you planning something witty? then make the plates stand out! (bright colours - Red is my preference against a black car) Are you planning something classic eg AB 1234, then use a classic style (Black with white letters) Don't want people to even bother looking at your plates, use the common (yellow with black letters or white with black letters) All comes down to personal choice, it's your car, these are just my opinion. :)