I would lean more towards mojave or fire, but that's my preference. It's all going to depend on what you want to make and what you like.
My advice to you is wait on getting another and save the money for a nice rack system. It will benefit you more to get your rack in and set up/dialed in before getting more snakes. While the aquariums may work just fine, you will be happier with the rack. Then once you have your rack start filling it up. Take your time! Worst thing you could do is just start going shopping crazy and get in over your head or pick something up you don't need or want later on...
Good luck to you on whatever you decide![]()