At the moment i dont keep any of those species, but have in the past kept green iguanas. My sugjestion would be to go for either a Blackthroat or a Tegu for sure. I my self am considering both species. I would deffinitly stay away from Green Ig's becuase as they can be a a little unpretictable as they age, and are just so common. Good luck with what ever you choose!!