Maybe you could convince your mom to go with you and meet the little guy. They really are quite endearing little guys. She may change her mind. And while thier noises can be loud, I find both of mine to be quieter than one budgie, BY FAR!
I saw a few ads for ringnecks in Calgary lately, I hope one of them is who your considering! I always feel like I should take every one of them in, LOL
Good Luck on convincing your mom!
I wouldnt recommend just getting him without her consent though. We wouldnt want to add to the number of homes this poor little guy has to leave because your mom puts her foot down.
But I know you know that!