I think that most would agree with me that bimac is the way to go. Sometimes the obvious answer is not what we are looking for. My bimac changes color like a switch flipping. Very active, very intelligent, very hungry, and come out to greet me EVERY TIME. He is about as cool as a creature as you could want. Also, he doesn't try to escape like the others. I could leave him without a hood and he would not try to escape, like most bi-macs. I know the attraction to the exotics, which is part of the reason for getting an Octo in the first place...but don't overlook the obvious.
Good luck...
Bill