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Something to take into consideration, noise ratings on fans are not standardized at all and you generally can't even make meaningful comparisons between fans of the same manufacturer. Fans make a certain amount of noise just moving air, even if there's zero motor or bearing noise, and 21dba is a completely unrealisticly low noise rating.
Also, larger fans moving the same amount of air overall will be moving that air much more slowly, over a larger area. A 92mm fan will feel very slow in comparison to a 40mm fan pushing the same air because it's much less concentrated. You'll still get the same air moved over the components though.
The fans I chose were Panasonic FBA09A12V, rated for 40cfm. They have bearings which can tolerate being mounted horizontally and are quiet and reliable, a close relative of the IMA fan which came in the Insight.
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