Carpet Pythons are a great choice, Beautiful and quite docile, good luck.
Ballpython13 are you serious. Snake goth has one snake and thats a corn snake, therefore he isnt ready for such a huge responsibility as a retic, plus a full grown retic would have no use for that height, as its too big to climb on branches. I think you should learn more about reptiles before you tell people to do things that aren't right and could make some one make a very bad decision.
Experience is a great advantage. The Problem is that when you get the experience, you're too damned old to do anything about it.