^good idea.
I agree about trusting Nismo and Nissan more, seems like they just can't make a bad car.
So far it seems like you've got the right mindset atleast, and everyone else's opnions on going to the dealership sounds good too. Don't go in there trigger happy, ask smart questions you know? Try not to come off as a newb to cars, because if I was a salesman that'd be like smelling blood and going for the kill. But you'll never know till you try, some salesmen are dick's, some are as cool as your bet friend. Oh and bringing someone thats a good haggler is definitely a good idea.
I say just go in to scope it all out then come back other day.