First of all, congrats!
I'm delivering at a hospital that offers water birth. Unfortunately, no birthing centers in my area, or that would have been my first option.
My husband and I are taking a general hospital based birthing course that includes a little bradley, a little lamaze, and a lot of general pregnancy/birth/medical intervention during labor information. The latter is a little disappointing since I prefer a natural birth. But I do like the fact that the class is very informative for my husband, who is very receptive to learning about pregnancy/birth and up till now didn't know much about the topic.
In addition to the planned water birth I am doing prenatal yoga (taking a class--very helpful!) and I just bought the following book:
HypnoBirthing: The Mongan Method: A natural approach to a safe, easier, more comfortable birthing (3rd Edition) (Paperback) Author Marie Mongan
Link at Amazon
I just started reading last night. It comes with a cd but I haven't had a chance to listen yet. I would love to take a class but can't afford it with the other classes we're taking.
Let me know what you decide! Good luck!