I'd avoid milksnakes, unless you bought an adult who was "tame." I don't mean in the sense of biting, but in the sense of relaxed when you handled it. I have a Nelson's, too, and although she would never, ever bite, she just doesn't want to be handled. You can feel it in her body- it's an offense to her. I respect that and only handle her for feeding and a photo session once in a while.
When I got my Cal King, the guy just gave him to me. He said she was the meanest snake in the world- struck, musked, bit, you name it. The first time I met Chox, when I went to pick her up, she musked a little, but ever since has been my lapdog snake. I just love her to pieces. She'll stay out for HOURS if I let her! She is always glass surfing when she realizes I'm around, in hopes of coming out. But the previous owner came over once, and I proudly got her out to show him how much she'd grown and how sweet she was, and she again coiled and struck and musked when I held her! Now I don't know why she would do this- this person definitely wouldn't mis-handle a snake- personality clash? I don't know. Still, because of my Cali, I look fondly upon all of them, seeing that potential for such a good companion.
Zee the tricolor hog is a funny, quirky snake. Ravenous appetite except during male springtime hunger strike, fun to handle, very small adult size. He "kills" his FT mice by envenomating them, which is very curious! He doesn't run, tries to burrow, is afraid of falling if placed in a tree- a good swimmer, good photo subject. They have come down _so much_ in price, too, since I got him!