Gotham can be bought from Hoefler & Co. It is a wonderful font for titles and headers. It is best paired with an italic or script font. I find the lowercase letters remind me of those ladybird books you use to read as a kid. It has a friendly appeal to it. I find that Gotham needs a lot of space, you can't crowd it in to a design - let it breathe and speak for its self.
Every font has a personality and Gotham's is cool calm and collect with a modern edge and a charm. You can't go wrong.