Switching Computers, How do I Transfer...

iTunes Music,
My Email,
My Documents?

I'm putting in an SSD in my MBP and am planning to reinstall from scratch, the old harddrive will be put into an external enclosure that I will be able to access.

Moving iTunes seems to be a simple matter of de-authorize computer and copy files over, am I right here?

Documents are also simply drag and drop, but what about email?

Is "Archive Mailbox" what I'm looking for?

Is there anything else I need to consider (grabbing my bookmarks, but not any keychains).