(BRB= Brazilian Rainbow Boa) Because BRB's ideally need 80% (as adults) humidity (although some say they have been able to keep them low as 70%), you cannot keep them in the traditional rack system. Babies need to be kept at 90% humidity. The best caging is a PVC viv. You mention a heater, I would not put her near it since it may lower humidity. Furthermore, stay away from heat lamps if you can, they are humidity's kryptonite.
Temp wise, I keep mine at 83 on the hot and 76 on the cool end. The ambient temp needs to be at least 75.
There really isn't a significant size difference between males and females. They are usually between 5-6 ft.
(Keep in mind I only own one at the moment), My BRB is quite sociable, and isn't nippy in the least. But she is a busy-body. Wants to constantly climb on me or anything she believes to be in her reach. On rare occasions she will just stay still. Sometimes it's a mix between climbing and chilling.
Prices can vary depending on the quality. For a normal usually ranges from $100-$200 (babies). If I were you, I would buy an adult (or close to it) since they are not as picky on the humidity requirements.
Humidity is one of the things you do need to watch. But if you do your research, you should be fine. Also, if the temps get over 90 degrees, it is fatal (so make sure you have a good thermostat, I would not buy a cheap one for a BRB).
I hear good things about the Dumeril's Boa but I have never owned one, so I cannot vouch for them, I'm sure someone will pitch in about them though.
I hope this helps you make a decision on which ever Boa you decide on. Just remember if you do choose a BRB, to do more research for the info above is just a general overview.
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