I suppose there will be a significant difference if the old paint is to be removed, vs spraying over the existing paint. In 2001 I did the latter, had some minor rust repair work done (including a rear fender lip repair panel) and had them weld-shut the side marker holes. I did the removal and re-installation of trim work myself, they did the remaining prepping and painting/polishing, and they perfectly matched the shade of white that was on the car (not the original color, which was blue). It ended up costing $900 (not a typo), although at the other place I had them do an estimation, they came up with $9,000 (also not a typo). Probably the quality of the $9,000 job would have been better, but not by a factor of 10. Then what I always say: "it pays to shop around".
Kevin's advice is what I would also suggest: try to save the original paint by having them closely match the color for, and redo, the one panel, and 'treating' the dings.
Good luck!
Cees ("Case") Klumper in Amsterdam
'69 white 280 SL automatic