I've owned an Umbrella cockatoo, very sweet, loveable, etc, but would have those screaming "fits" when I was out of sight. Very stressful.
I'm sold on the African birds... I love my greys, but would have a Jardine's parrot again in a heartbeat. They are loveable, pretty, funny, playful and talk as well. They are just the right size, bigger than a cockatiel, smaller than a goffin's. My favorite of all.