Those that disagree, please chime in...
But in general, the later the model the better it is. The early ones, also known as pushbuttons due to the Renault 5 like door"handles" lacked a lot of brazings and stiffness. Later models were improved, Technical Service Bulletins were issued and included on new cars. On later models handling and amenities were improved.
There are some exceptions to this. First, as you may already have noticed, Pantera owners are crafty people, so many have updated their cars so they're as good as newer ones. Second, some later models had weak rear suspension attaching points, fellows, help me here.
Mine is a quite early model, but that's simply because I'm a sucker for beauty, and this model is the most beautiful IMHO.
Oh and BTW, buy a Longchamp. It's a musclecar that handles and has a great interior. Since getting my Longchamp, all my musclecars are sold or for sale
