Wait until you get more! Cages take up lots of space!
I completely disagree with the belief that cages make chameleons more aggressive, and free ranges make them 'happier.' My male veiled was completely terrified and stressed out when I tried free ranging him. He likes his cage, and in his cage he will stay. The only place outside of his cage that doesnt seem to stress him out is outdoors time.
My now 'friendly' panther (who is free ranged) did not have a sudden temperament change. In fact, he lived in a cage for many months. He gradually got less and less scared of me, and eventually began to climb out for rides. After this happened I started to free range him for part of the day. He stopped liking his cage, but he was still friendly regardless.