Looking for a large bird cage

Two months ago we got one parakeet. Now I have some free time and going to look for a larger bird cage.

We are going to get another parakeet soon. I think they will need a bigger cage. Why?



 I am going to hang few new toys there. Also the parakeet needed a larger space so he can spread wings. And many birds love to jump from level to level.

IMHO birds need as large cages as possible. Mobile birds are happy! What do you think?

Back to my dream cage.
 I like cages with a pullable bottom tray. So I can clean the cage easily. Any good cage should be with wheels. My wife loves to move cages around.

I am going to look at local stores first.