Conures hands down for sure for me.
Although have to say, caiques as of yesterday are on that list lol. The local store has a lil black-cap caique that learned a very shrill piercing whistle sounds like a missile strike
I also don't like quakers very much.
The big guys don't bother me. It's really the pitch---if it's sharp and shrill and makes my ears ring or pop then its definetly annoying. Plain volume isn't really a problem.