I got a Colombian BCI (common red tail boa) as my second snake and it was wonderful! She was a perfect choice. 6-7 is average for males with females averaging a foot or two bigger. Dumerils can get big too - they don't necessarily stay smaller than BCIs - but they are wonderful snakes too. Most are quite calm, but enjoy being handled. And they are both intelligent and active.
I would not really recommend an Argentine boa for your first boa. They generally tend to be rather hissy and assertive. Most of it is bluff, but it can be intimidating. And they do also tend to get quite large. My boy is a puppy once I pick him up, but he definitely has an attitude! On the other hand, my two Colombians are the sweetest snakes on the planet!
A Colombian BCI or a Dumerils is your best choice for a second snake - you can't go wrong with either one!
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