Yup, anything in the Morelia genus has you covered! (Albeit Green Tree pythons can be a bit sketchy on handling, a little dedicated handling could go a long way.) Also look into Macklot's pythons, Liasis mackloti. They are just as active, get a bit chunkier than the average long-ratio python, but perfect size under your description. Another odd aussie you can look into is the woma python, Aspidites ramsayi, very curious and active, and again, larger than a ball python, but smaller than the largest Boa constrictor. They also have one of my favorite patterns on a non-venomous snake- a blending gradient in each beautiful stripe!
P.S. I hear Dumeril's are only as active as the ball python, and much can be said about them being pet rocks, so be aware of that, if activity is a quality you are looking for.
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