All three cars are worthy candidates and like most Panteras are very different from each other.
However, if I had your money to spend I would easily opt for number two. The car is incredibly beautiful..and as a rare pushbutton may appreciate in value more than the other two.
I've also known the current owner for many years and consider him to be one of the nicest and classiest Pantera owners I've had the pleasure of dealing with. I would easily pay him the asking price and not look back.