Everyone has given excellent advice and accurate depictions of personality. The biggest thing to consider, and I do mean you need to seriously consider it, is the size and housing requirements of adult boas. While they vary in size, proper housing is quite expensive. I've got two boas and am looking at ordering them custom 6x2's in the next few months. While there are a few very specific things I want in those cages that make them more expensive, I'm looking at roughly $700 per cage. You can get a little cheaper, but I'm just saying, it's expensive. In the housing department, BPs are much cheaper.

If that is not an issue for you though, by all means go with the boa. Can't beat the inquisitive nature and awesome personalities of boas.