Here's a non-technical, non-fiscal view, also from downunder. The decision is more satisfying if based purely on emotion. I gained a yearning for the 5127 on this site (check out the posts from 'Dave from Wales', who was almost single-handedly responsible) and bought one from another Purist who frequently contributes here. It delights me daily. If either the PP or the Blancpain does that for you, go for it: for no other reason but the pure emotion of it. You will not be disappointed.
Good luck with the process.
pplater.