When we purchased our first BP last summer, we purchased an Exo-Terra viv (24"x18"x12"). Humidity on Long Island during the winter was a challenge to say the least.
Recently we purchased an RBI viv (3'x2'x12") when our boy hit 800 grams and I cannot believe the difference. Switching from glass/UTH/CHE to PVC/UTH/RHP has vastly improved our husbandry. Temps are more uniformly distributed by the RHP and the PVC enclosure holds the humidity so much better than glass.
The difference in total cost between the Exo-Terra set up and the RBI set up was around $150 and well worth it. Something to think about...
I agree with what others have said about large enclosure and security needs for hatchlings.
We have a new girl now who currently occupies our Exo-Terra viv however we are ordering another RBI viv for her. We are thinking about keeping her in a smaller tub, placed inside the RBI viv until she is big enough to comfortably move into the viv. But with summer coming, humidity will not be an issue, so we may abandon that plan and leave her in the Exo-Terra until next winter.