BCIs: Hog Islands, Colombians, Central American boas, Nics, Caulker Cays, Mexican boas, etc
BCCs: Peruvians, Surinames, Guyanas, Brazilians, etc

I recommend a male Colombian, they should stay in the range you want and they're hardy, easy keepers, and most have wonderful personalities. They come in lots of morphs too Just keep in mind a male will need at least a 4' cage, recommended 4' x '2 x 2'