Had them check it out at the dealer today, the Service Advisor was familiar with the clunk sound. He even went into detail about the clunk and some small chatter after the initial clunk, calling it the cement mixer sound.
Guess I bought a $40K cement mixer with leather seats and nav
Apparently this has been an issue on some of the 350z's as well. They said Everything checks out ok, and they are going with it's a design thing.
If it is a design thing, I guess I can deal with it, but I sure don't like it.
I think it will prob take a few people to complain about this before Nissan USA would issue a fix. So, I guess I'm stuck with it for now.