If you're looking for a boa, I'd say just pick up one from a good local or semi-local breeder. You'll get a snake with a GOOD history (18" at 5 years... My corn snake is bigger than that! By a lot) and you'll be able to get to do the 'raising from a baby to an awesome big animal' experience.

Hold onto your BP girl. You don't want her going there to be fed once a month