The bigger, the better. Provide your Amazon the biggest, sturdiest cage you can afford. Buy American. Cheap imported cages bought on E-bay have problems with parts not fitting, stain peeling and possibly toxic metals and stains used.
Furnish the cage with swings, ropes, soft wood to chew on and toys.
For breeding - build the aviary. Works better. You can find all kind of designs on the web.