Fan comparision/recommendations for SN27P2

Hello everyone,

I've tried searching for a response to this however all the posts that I can find either miss the mark or are so old that I question the relevance of the information (new tech, etc).

I'm looking for a comparison between the stock Shuttle fans for the SN27P2 and retail stuff. Also, I'm hoping to find specific recommendations for fans (I'm not looking to spend too much money, but I am willing to make smart investments if something is outside my price range).

Any help would be greatly appreciated.

Thanks!