Phanteks, Noctua's, Be Quiet's, if you can still find them then, Scythe Gentle Typhoon AP's. You might want to also factor in that audio can be perceived differently by different folks. Some people can hear the ticking of the motor in a fan, some people can't even hear the pitch of the fan as it cuts through air.
Are you looking for fans to use in a case(airflow) or on a radiator(cooler)?