I've done the PDR and the Va Beach Rock n Roll Half -- love them both, though (word of CAUTION) Va Beach does get very warm and muggy for BOPers like me.
The PDR was great because Philly is such a neat place to visit -- the Liberty Bell, the art museum, the run along the river -- I'd go back every year if it weren't so far from me.
Have fun, WISHers!!!