I'm biased because I have my longicauda and no Caulkers but I would go with a nice BCL: will have the size and coloration you want (IMO the contrasted BCL adults are more aesthetic than the Caulkers, only personal preference) and my girl is such a sweetie. If temperament is a concern just remember with some work even nippy snakes will usually calm over time (pending the individual but in my experience they do). I have purchased from Vin before (a Pokigron Suri) and he's top notch and recommended for stunning animals and A+ customer service.
Edit: another option may be a male Hog Island Boa (peach colored, smaller staying locality, great overall temperaments)












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