The biggest size you can afford, we have a top that you can open and put a perch in but never use it because we have a lot of hanging toys from the roof, if I were to buy another cage I'd get a play top but one that sits on top of the cage instead of bring part of it. I think size is more important. I made a stand out of eucalyptus branches which is on wheels so I can take it from room to room., Shadow spends most of her time out of the cage on that.