having had both on the wrist, my inclination is for the 5165.
Patrice, you are correct that vintage Rolex sings to me. But i also have a couple of modern Rolex too. I think the vintage element of Rolex is very much its history and story behind a watch. that doesn't seem as important to me on Patek. Not sure why not. On the wrist, the 5165 took it for me.
Looking like the first buy of 2011!