Going with a BRB as a first boa is a big change from owning BPs. I would caution against this, unless you are prepared and ready to deal with their unique husbandry. Young BRB boas need almost 100% humidity, with temperatures not rising above mid 80s. This in and of itself isnt that challenging, as long as you limit ventilation. However, keeping an enclosure this humid results in significant mold formation that must be dealt with.
I honestly would just go with a BCI. They are much hardier, usually friendlier right off the bat, and come in a myriad of color morphs. Boas grow much slower than most would believe, not achieving true adult sizes until 3-4 years old with correct feeding. This gives plenty of time to grow as a keeper yourself and get used to your new reptile.
Hogg island boas are interesting, but many have noticed a propensity for a nasty attitude from them. Not to say there arent many easy going hoggs, just seems to be a noticed characteristic.