I think Natalie and Monk would make a great couple I think they look adorable together. It would be a great way to end the series. Sorry I just don't see Natalie and Randy together AT ALL. They don't have anything in common. It's just not there. Nat and Monk have more in common. They have a connection.
I don't see it either..between Randy and Natalie. It's almost like a brother/sister thing they've got going on, if that. I honestly think that the writers are hinting towards Natalie/Monk progression [romantically]..hopefully in season 7 there will be even more progression!