Several people said Bench now... I really don't think he's all that close to this list. He moved to the CIF positions by his fairly early 30s... Not everybody can be like the Pudges and catch into their 40s, but I don't see Bench being that close.
My feeling is that the list is going to be disproportionately modern. I guessed Ausmus, but there have been a lot of guys - Piazza, Posada, Bengie Molina - who have continued catching into their late '30s, which used to be a lot more rare. Modern medicine I guess...