I think all these multi drive enclosures are overkill for what I want. I was thinking of using 2 or 3 ICY BOX single drive enclosures. That way the whole system would end up completely fanless.

http://www.planetmicro.co.uk/product_info.asp?stockcode=M003740

It means I will end up with a power supply for the server and one each for every enclosure, but that is worth it if the whole setup is fanless.
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