ya i have a cockatiel, it only screams if it has no food or water, they are messy eaters, seeds everywhere, if u get a female she will lay eggs through the year,
Ours never screamed, but called. Never noticed them being anymore messy than our budgies and doves. And I've only had my female lay an egg once when I first got her. Never another all the three years I've had her.
Still vote for cockatiels if it's your first bird. Better to leave bigger pirds (parrots, cockatoos etc) after you've had some bird experience. Although I've heard that parrotlets are everything like a parrot sans the bad parts.