I have all concentrations in current and vintage. The current formulations have coarsened somewhat, compared to the vintage. If you want to try the vintage, I would recommend going for the cologne. This is rich, strong and has a good lasting power. It is generally more available than vintage parfum, which to the modern sensibility, has plenty of animalic tone to it.
Of the current versions, I believe the EDT is the prettiest, and also the one that keeps closest to the spirit of the original. Like all light formulations, it does not have massive longevity or projection, but that all depends on the wearer's skin. Generally, the drier the skin type, the more it tends to 'eat' perfumes. If your gf is lucky enough to have mediterranean colouring, she will probably get a fair life out of the EDT on her skin. If she is fair, then a light, non-perfumed moisturiser will help extend the life of the perfume on her skin.