If you're not prepared for 15+ foot snake in a few years, retics are not a good choice for you. Aside from the basic logistical concerns (huge cage, expensive food budget), keeping an animal that large requires knowledge of how to handle it safely, because it is stronger and faster than you. It's generally best to have 2 or more people involved, and even then it can be awkward and/or dangerous if the snake isn't in a mood to cooperate.