panaflo fans are widely regarded as some of the best you can get here on AT, in terms of their cfm/noise ratio. i personally have many, and am very happy with each and every one. the noise rating is entirely up to you. some people have an amazingly high tolerance to high-pitched whines in their ears 27/7, but i know that i am not one of them. the bearing type isnt that important, as long as the brand has a solid reputation. both types can be good.