I have worked with large 5 foot camain and I personally recommend against it. they are difficult animals to work with and in the end, they are hard to re home. Not to many places will take them from you and if they do, its at your cost for the shipping and handling of a large animal.
I would just stick to the snakes, they are far easier to care for in the long run. But if you do venture into these guys, there is a fantastic article on building a caging for them in the recent Reptiles magazine (i would say in the last 2-3 months.)