All of the Pyrrhura conures would be great ones that would fit what you want and they aren't as lounds as the suns either. The Senegal would be another good match for you I think. And the mini macaws are just as loud as a sun conure they just are on a different pitch then them so unless it was the pitch of them I would avoid them or any larger bird then the suns because the larger the bird the stronger the voice they have. And I am all for adoption since there are so many out there needing homes just be aware of all of the potentional problems the bird may have. I would recommend going to a bird store and seeing of their are any you like,