Auggie, I am actually leaning towards the caique. I actually am looking at Sun Conures as well. The Mrs. wants an Eclectus which I'm not arguing about. She also likes the Rose Breasted or Umbrella Cockatoo. So, who knows. I'm still liking the White-bellied caique.
Caiques, i have heard are GREAT birds. They can be VERY playful, i think they are pretty similar in personality with the conure, only quieter. There are two species of the Caique. The Black Headed/Capped Caique, or the White bellied caique. Both i think about the same in personality, i think its just the visual colour that's different.
Captivating Clowns
Sun conures are great too, however they are LOUD. lol Another that is VERY loud are any of the cockatoos. So if you dont want a screamer i would cross those off your list.
If you liked the sun conures personality but wanted something not quite as loud, perhaps try looking into the green cheek conure. Again they have some really pretty mutations.
Eclectus's are definitatly one of the birds that i would love to own some day. The males are green, and the females are red. So right away you would know exactly what gender your getting. They do need somewhat of a specialized diet. They're metabolism is a little slower than other birds so you need to feed them pellets or foods that are low in fat. An all veggie/fresh foods diet is even better. This can be with mashes or whatever. They also have a few health concerns that can come along if they do experiance an unhealthy diet such as 'toe tapping' can be common in them. However this can usually be corrected again with a good diet again.
I haven't had a chance to take a good look at this website yet, but i've been told that this website is VERY helpful for eclectus owners, or future owners.
Eclectus Parrots
also an article on Toe Tapping
"toe-tapping" in Eclectus Parrot
There are also i beleive three different sub species of the eclectus.
This link just explains the differences between the three.
Subspecies ID