This isn't an answer to your question but if you are thinking of having a complete respray done then be sure to take some good quality photos of the scratches before hand.
I, like you, had a car which was very badly scratched down one side and had it completely resprayed. When I came to sell it I had no end of hassle trying to explain that it hadn't been crashed just scratched. I probably lost about a grand in the selling price because of it. If I had have had the wit to photograph it before the respray then it probably would have helped my case.