Hi i own 1 normal green cheek conure,1 cinnamon green cheek conure, 1 blue quaker and soon to be sun conure. But out of the birds i own now Aqua my quaker is the loudest but also the best talker. He picks up words so easy he says whos a pretty boy,pretty boy,pretty paul,einstein,shelley,stop it,shut up,what ya what ya doin, arsshole,Aqua,Aqua arsshole,arsshole Aqua,lunch,wait,naughty boy,arh.come here and probably more i'm forgetting. His still learning he is only 1 year old started talking at 6 months old or maybe younger i've forgotten. The down side is even tho i hand reared him from 3 weeks old he loves my boyfriend more so then me. When he was younger he was good would go to anyone and everyone but now he will only go to my boyfriend. My cinnamon green cheek conure MaYa is the same with me she will hop up on other peoples hands if she falls off the end of the bed but if you don't put her on the end of the bed again she will begin to bite till you do.She will also not allow other people to pat her on the back she will allow head scratch's but on her terms only. I can pat her on the back scratch her head and hold her. MoJo my normal green cheek conure will go to anyone and everyone for pats,cuddles,head scratch's.
I wouldn't get a bird just for its talking ability better off going for personality, find out what sort of personality you want in a bird. Not all birds learn to talk or want to talk even within the same species. Two people could own african greys but only 1 of those african greys might talk. I've known some quakers that don't talk at all,some that will only say a few words, then some that can't shut up like my quaker lol.
The number 1 bird for talking would be the african grey but there expensive here in australia about $4,000 for a hand reared baby. I've been told that Quakers have the same intelligence as african greys but aren't as clear in the talking like the african grey is. Then you have the galahs,toos,macaws,electus parrot,tiels. It also depends on how much your willing to spend on a bird. Green quakers range from $150 to $300 blue quakers start from $300 to $350 depending also on the breeders. African greys $4,000 or more, Macaws $7,000 or more, electus parrot $600 to $900, galahs $100 to $300,toos $100 to $1,500 depending on what species, tiels $80 to $100, green cheek conures $100 to $400 depending on the mutation,sun conures $300 to $650 all prices for single hand reared birds.
Your best bet is to know what type of personality you want in a bird then research the species your interested in to find out if thats the personality your after. My green cheek conures additude is a big bird in a small birds body eg my green cheek conures think they can take on anything, There very active,cheeky,playfull,willing to go anywhere,willing to try new things, are very jealous birds that fight over my attention. My quaker on the other hand is more mellow is willing to try make friends with any bird he meets,not very active,is a wuss will run instand of standing his ground, will not try new things,but will go anywhere with you, is cheeky speciallyy with talking eg if someone is making to much noise Aqua yells out shut up lol,his smart knows when to say things at the right time. I hope this has helped some.