Well, you may hear this more than once on this site, but let me be the first, you for sure should go PT.
I'll give you a couple reasons--my own personal opinion and feelings of course-
You use the car more when it is setup for PT
It handles far better than a resto
Because it handles far better, you enjoy driving it and drive it more
The vast majority of PT folks are the best there are --especially here at Lat G
You don't see to many of these setup for PT--hence it makes it even cooler
I think in the end, the cost is about the same (many variables of course)
Two reasons why you may not want too--
Your Mopar fanatic brohams are not quite as understanding about such mods on such a fine piece as this---you would have some haters occasionally--but they would be offset by the number of folks who would kill for a PT Challenger done right.
You could finish restoring and sell it and buy two 69 Camaros. That's a strong case for resto--however I am a bit biased.
Good luck and let us know what you do!
Doug