I have a wonderful senegal parrot. They are not large birds. Toby talks quite fluently. The first thing she learned, from me, was "feed the fish", as I would pick her up and she would come with me when I fed the fish, I would say lets go feed the fish! and she sing songs it now whenever she wants personal attention. Of course, we have the usual, good morning, good night toby, pretty bird and her own imitation of me calling the dog and cat...come on barney and here kitty kitty.
She picks up phrases non stop now. (much to the dismay of the other animals in the house).
Senegals are not extremely expensive, 400-600 is what I have seen them for. The cage requirements are smaller than the bigger birds are. More along the lines of a large cockatiel cage. They are also not super loud shriekers ( a definite plus ).