If you don't want big, you'll want to stay away from BCO. Male Argentines normally grow to around 8' and females will top 10'. My female isn't quite 3 years old, and already 5'6"! Look at Dumeril's Boas, as males usually end up at around 5-6' and females 6-7', although there are exceptions. Their temperments are hard to beat as well.
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