raid storage device with 8+ hdd's [closed]

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http://serverfault.com – I am looking for a raid storage device that can hold minimum 8 hdd's with ZFS RaidZ to store the data redundant without the need of drives of the same size etc. The software is not a problem, I just don't find the perfect hardware to realize this. I don't want a full-desktop sized server, but something much smaller with a mini-ATX motherboard. Does somebody have some good advice to buy or to build something like this, or does it not exist? edit: I'm looking for something like this:http://www.backblaze.com/petabytes-on-a-budget-how-to-build-cheap-cloud-storage.html but a little less extreme (HowTos)