I had to think about this for a while, since you still haven't actually acquired the bird you said you wanted. Well that, coupled with the fact you already own bird species that I have extensive experience with – so I'm trying to figure out what part of your life that you needed to come from a bird they weren't already fulfilling.
Here's what I came up with:
Budgies are bossy and domineering as all hell and some seed only fed birds develop vitamin A deficiencies that causes malformations in the throat making their speech almost inaudible(happened to one of mine).
Cockatiels are clingy, needy, and have repetitive calls that rarely develop speech and are always shedding feather dander.
Those are the things you don't want, because you already have them in your pre-existing birds.
I am thinking that for you a good match would be a greater vasa parrot. They're little bigger than a Congo African grey, highly intelligent, playful, and are relatively quiet outside of their breeding season.There are also like nothing else you could possibly encounter in other parrot species, and have a complete lack of jealousy towards other birds.
Google them..... I think one would make you happy
~I use Dragon NaturallySpeaking 12 voice recognition software to type ~