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When you are about to build a RAID, make sure you understand your storage requirements.
The following points are significant:
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Array capacity.
Whatever your capacity requirements are, these are underestimated, most likely by the factor of two.
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Budget limits.
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Expected activity profile, especially read-to-write ratio.
If there are mostly reads and few writes, then RAID 5 or RAID 6 would be OK.
If significant random write activity is expected, consider RAID 10 instead.
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Expected lifetime.
Whatever the projected lifetime of the storage system is, it is underestimated.
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For a quick estimation of capacities for various RAID levels, check the online RAID calculator.
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