If you can feel the scratch it will need a respray but if not it might polish out. Go ask at a body shop and find out you never know. Cost may also be cheaper if you have a solid colour rather than the two coat metallic like mine.
I decided that it had to be done as every time I see it I just get all angry and unnecessary again. Also wanted to get it done before they start spreading salt over the roads, don't want that getting under the paint making it even worse