I have seen some really cool cage topper things you can put on a 10 gallon aquarium (which is fine to start with), that allows them to climb and do what they love without costing you a lot for a higher cage later on. Thewy also have them for a 20 gallon etc as well, that I have seen. Your little guy would do best with another little guy to keep him company so you really ought to get two if you are going to get him. They just so best with more than one, emotionally. They are great pets, I love them. I have 4 girls, little terrors that they are getting into everything LOL. Someone left their box of cheerios too close to their cage, and they reached out with theri little arms, pulled it close and ate half the box away LOL.