I don't know how much experience you have with snakes etc, personally I prefer the scrubies, I have a pair which I'm hoping to breed this year.
Lots of things come into consideration when looking at getting a scrubby, and more so if you're looking at getting a pair. One of those things is their size and temperament. My male is reasonable, doesn't bite to much but the female, um, how can I put this?? I have a inland taipan and he is known as the Anti Christ. I would much rather handle him than the female scrubby. She is pure evil, and at nearly 9 feet she's starting to get to a size that is a bit difficult to handle without being nailed. And nailed and nailed. God help me when she is 15-18 feet long. A full grown adult with a less that pleasent disposision could take down any children who unfortunatly get in thier way. Possibly an adult as well. This being said, plenty of people keep them, so you just have to keep in mind these snakes can be dangerous and IMO shouldn't be purchased by inexperienced/novice keepers.
As for the enclosure, just think big. And for food, remember, in the wild they can take down small wallabies so lots of rabbits, chickens and anything else they can get down