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That is pretty much perfect for your usage.
As for disks... go for size now, don't buy all of the disks from the same manufacturer and from the same batch. i.e. if you really insist on buy all Seagate or Western Digital drives... order 2 from one supplier, 1 from another, 1 from another.
Disks made at the same time, and with the same spec, tend to fail at the same time. RAID5 will give you protection against a single disk failure, but don't push your luck by buying identical disks from the same production batch that will likely fail at the same time. Just mix it up, so long as the capacity is the same there is nothing stopping you mixing producers either... feel free to mix Samsung with Seagate, etc.
Cheers, as always you seem to know what I need more than I do!
I suspect I shall do this in stages, so will spec the NAS box first, then move onto a plex box, I have a few old machines floating round the office so might be able to use one of those...
looking at the QNAP stuff, would one of these do the trick or would you recommend a higher spec version?