Need some birds to put in an aviary (need help with what types)?

ive just got an aviary its approx 2mx2m. i was wondering what sort of birds i should put in there, i would rather not have budgies or cockatiels- ive had them before so im looking for something different. some more prettier parrots or something, also i dont want a bird thats going to cost me like 500 dollars for one, something on the cheaper scale. and how many birds can i comfortably fit in there.