I've never heard of a 9' brazilian, nor have I heard of them being nippy. I have a great pair both right around 5 feet and very nice snakes. They do require LOTS more care than a corn however. A brb needs high humidity and you must make sure that the temps do not get too high.
Emilsmee is right about their hiding though. They are almost always hidden away except for a few glimpses you may catch of them out at night.
I would suggest a carpet python (I love JCPs) as they usually calm with age, and the nippy-ness as young will not cause any damage...
0.1 Corn Snake (Anery), 1.1 JCP (High Yellow), 1.1 BRB, 1.0 Albino BCI, 0.1 Het Albino BCI, 1.0 GTP (Jayapura type)