I don't have my bird yet, but I could have written your list of requirements, except that the bird will be more for me instead of my husband! Same allergy situation, cage situation, want the bird to be friendly with everyone, etc.
I've decided on a green cheek conure. There's some "fancier" green cheeks now, if you are willing to pay more. Check out some of the different colors here:
GREENCHEEKCONURE.COM
I know NOTHING about this breeder, so this is NOT an endorsement. I just did a search for color variations and that's one site that showed up on google!
Good luck with your choice.