I went with a BRB as a first snake after BP's and it worked out just fine so I would say its an option. They just need high humidity and slightly lower temperatures as josh said. I don't quite understand what you're saying about size though. Do you want one thats thicker than a BP but can be much longer? Because BP's are short fat snakes compared to most boa species. Any snake that is thicker than a BP is likely to be much longer. Dumerils can get to very large (long) sizes. Or are you saying you want one that is thicker but not much longer than a BP?
Aside from that I would choose any of the insular Chilabothrus species such as DRMB, Jamaican Boas, or Bahama Boas. They are all super cool although I don't know that they get thicker than a ball python. Certainly a bit longer though. I would also recommend BRB's but again they get longer but I don't think they really get thicker than a BP. I haven't dealt with any BI or BC so I can't say anything about those as I've always been attracted to the rarer species.
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