Mine was originally Silver Blue. It's a matter of personal taste, unless you're painting it to sell or compete for NCRS certification or it's a very original car, otherwise, paint it something you'll enjoy living with. Yes, a non-original color probably would lower the resale value. However, considering the changes in paint over the years, it's unlikely you could ever get an exact match to the original metallic Silver Blue.
In my case I repainted mine 'way back in about 1968 to 1967 Lynndale Blue, which was more to my liking and which is probably how it'll stay 'cause I still love the color and it's very unlikely I'd EVER sell. Back when I made the decision, a used Corvette was just a slightly more expensive used car. I might make a different decision today. My hardtop never was repainted, it's still Silver Blue.