I am an insurance appraiser and have years of writing estimates inspecting cars etc. PDR is definitely the way to go (assuming that the dent can be repaired using this method) there are several reasons. First it is cheaper and you can get better results, the caveat here is that you use an experienced PDR guy, and not some fly by night storm chaser. The repair will not be breaking into the factory paint so there are no issues with paint match or clear coat or adjacent panels. Just make sure that they do NOT drill any holes, usually the fly by night guys will drill a hole to gain access because its faster but the really good PDR guys will not and have very special tools to get behind a panel. If you've ever watched a PDR tech work it is almost like an art form. I also do not recommend the DIY PDR or hot glue kits you can buy, they usually give poor results by either "oil calling" the dent or pulling the paint off. Depending on the dent size and material (Aluminum is more expensive than steel) it should cost between $100-200 but prices vary. Also this isn't an I need it done right not type of repair as long as the paint and clear coat aren't damaged you can wait and shop around, or at least until you get your Economic Stimulus check(LOL j/k)