Looking for a new friend.

[Rome]

ok im planning on getting one of the following:

1. an ATB for 100$



2. an HIB (hog island boa)

3. i might be getting a rainbow boa no matter what

4. or a corn/milk/king snake

5.tree boa

now i already have a glossy snake and im really getting into herps. i can get necessary needs for them food/habitat/ etc. but i just wanna know which one is a better one to have. i want one that like to climb from time to time, can be tamped easily. some one help me out. thanks. (o and im only picking 1 or two from the list