I've had a great experience with an Sulfur Crested Cockatoo.
She is a very sweet girl who loves to get head , neck, and under the wing scratches. She'll start grooming your head if you're still enough.
She's not bonded to a specific person and will ask anybody for some love. She's not very talkative, but will cry out for attention once in a while.
My boyfriend had an Umbrella Cockatoo a few years ago.
His mother breeds Yorkshire Terriers. The bird thought he was a Yorkie and would run on the floor barking with the pack.
A very interesting bird.