Hey Gerardo just throwing in Brazilian rainbow boa as an idea. Also visited this place called Chicago reptile house a couple years ago and almost got a diamond python. I think its a more interesting and rarer type of carpet python or maybe one of the other Australian related pythons like black heads or woma's. From what i understand none of these get really big and aren't really hard to take care of. Course all of these might be hard to come by. I also hear bh's and woma's have their own personalities and can or do have a aggressive feeding response but should also mention i've never heard a horror story from any of these pythons as well.