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For the OS and apps I usually recommend RAID 0, 1, or 0+1. For data storage I usually recommend RAID 5.
RAID 5 is actually slower in performance than RAID 1 . It is known to be slower for writes, because of the CPU overhead that is reqiured for each write. You can put the OS on a RAID 5 but you might find the system performance to suffer.
The plus to a RAID 5 is it's ability to rebuild on the fly. Another note, optimal configuration for a RAID 5 is 4 to 6 identical disks plus a hot spare. Less than that is not worth it and a RAID 1 would be a better choice.
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