Do get yourself a copy of this one; I'd recommend seeing Jean de Florette first as it is a definite continuation of the story, but Manon does stand up on its own merits as well.
The general feeling amongst the film club regulars was that it's an even better film than Jean; I'm not so sure. It certainly has a stronger storyline, but I'd prefer to think of them as one magnum opus. In a couple of years time I reckon we'll have to do a back-to-back viewing, just to see.
In the meantime: a still from, perhaps, a favourite scene. Can't think why I liked this particular scene so much.