The 2 products has about the same price. I will use a NAS for HTPC use, and office uses (my office is at home), since my library is rapidly expanding, i will use 2 TB drives at first on RAID 1, and soon will expand it, therefore i need at least 4 bays and the option to expand the array to RAID 5 without rebuilding it.
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Just found that QNAP TS-509 Pro / TS559 Pro are also a possibility.
It will be my first NAS, i will need the community help to choose it.