I would go with a BCC. This girl is 4 years old in the picture where her and my boys are playing in the street by our house and she is a manageable size. We had her from hatching until I left to come over here, as my wife didn't want to have to take care of her by herself. She was a little afraid of her. She was only aggressive at feeding times but was otherwise a perfect angel. As for being active in the tank, good luck finding a snake that is. I think most are at certain times of day (as in at dusk/night) but with the 7 species of snakes that I've owned none were out and about on a regular basis.
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