I'm certainly no expert on these matters, but I'd concur with many of the points made in this thread, but also add; How easy is a given bike to restore and how much $$$? If the parts are very hard to come by, or have to be handmade, that could affect ... more »

I would expect any competent automotive dent repair person should be able to remove most dents from a tank. They do pretty good work on cars and often are able to access difficult to reach areas.