the problem with parrots are they are all individuals, the Senegal's I have, Sparky is good with me providing I read his body language he has bit me twice and I do call them Draculas with wings or clingon's, I will say a one person bird, Niblet will go to any one young old male or female. I have had one bite but that was my fault, I normally bring him to shows with me, Terry I share with a elderly person, he love her but also gets on well with me, they can be very loving and I find them easy to train, good if in a cage for long times providing they have plenty to do. one bird I recommend for some one having a busy life style I looked after a female that was extremely loving with any one, on the down side is these birds are very popular around kent so i find I get calls regarding them attacking others, this is normally controllable with training not only the parrot but more the owners. Have you looked into Meyer's parrot, very similar species but not flighty and a far calmer bird?
The green cheek conure is know to be nippy in its younger years as are many conures, are, they will grow out of it but the nips are not bad as they love a bit of rough play. they can become very loving birds and normally do not choose a favorite and attack other members, I have several species of conures my favorite is the Sun Conure but the only problem is they can give a loud sharp call. mne often ends up sleeping with me. I have found the Pineapple the less nippy of the green cheek's
the Caique, my experience with these is rather limited to a few birds they are very boisterous and also like rough play, they are comical but to be honest I will rather see them with another caique they can play with, the ones I have looked after have been friendly but also destructive so its important that they get a lot of stimulation, we have a few members that can tell you more about these birds and there ways