Get a male Hogg island boa if you want a smaller one. I think they max at about 6 feet. Normal BCI are awesome too. Males of most of the Boids tend to be smaller than females. So if size is a worry, go male.
I have a juv female BCI and she is amazing to handle, interact with, and to show off. Boas get a bad rap about being mean and nasty but in my experience that's not the case. I would suggest boa.
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