Targa,
A while ago I saw the results of the paintless removal of a very tough dent done by a tech from High Marques in Morristown, NJ. I was amazed at the results. Location and type of dent will dictate the end result. Most dent removal places will offer a 100% Money Back Guarantee if you're not satisfied. I would insist on it.
Wherever you go make sure they use tools that will not scratch the backside of the panel. Also, inquire as to how they will access the dent. You might want to make sure they dont drill holes unless absolutely neccessary.
As for the mechanical work at High Marques......I've heard about experiences that were less than positive.
Rick
High Marques