Between the rubber and rosy boas, I would go with the rosy. They are captive bred in large numbers and a variety of localities with differning colors, and even albinos. They do very well in captivity and most captive bred are on f/t mice. Rubbers are a bit sensitive IMO and can easily decline if not kept well lit and on the cooler side. Still, rubber boas are great snakes and I would suggest getting a VERY well established captive bred adult or subadult. New born rosys are easily found. Both would do well size wise in the cage you are interested in. You could push it a bit and 3.5 foot snake could probably do OK. The larger common king species like Florida, Eastern, Desert, Brooks, and even Cal kings would probably outgrow it. The arizona mountain king is a good colorful choice, along with variable kings (thayeri) and most greybands because they usually stay three foot or so in length.

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