If the body repairs are done well and are not clearly visible the affect on a car's value is minimal, but it does depend on how rare the car is. If a car is very rare it will have little affect, but if a car isn't so rare it is likely to have a greater affect. The cars you list aren't terribly old and they are still relatively common in classic terms, so I would be buying the car in the best condition possible. I would be very careful about buying the cars you list, as I reckon you'll be waiting a long time for the values to appreciate substantially.