Are you being paid? Can I get your internationally known industrialist to work for free on my project that could lead to bigger things?
If this project matters to your mystery man, he should be willing to pay to produce it. If not why should it matter to me?
From our experience, the biggest problem with hardware RAID is the if the box dies, you are likely to lose everything because it is common that the new controller will not work with the old controller's data. On the other hand, one can always build a new system and run the old drives with software RAID.
I agree that RAID-5 has lots of problems in the >1TB drive world, as do the filesystems both windows and OS X use. For critical systems, we prefer software RAID (we gain speed as our systems improve) and ideally better filesystems (we prefer ZFS and use either RAID Z2 or RAID Z3). We do not consider RAID as a back up, but just to improve reliability while working (to prevent a failure during editing, rather than to prevent data loss in general).
We back up our data to some combination of: other systems, stand alone drives, Crashplan, and/or dropbox.
We expect drives to last 3 years and try to cycle them every 2.
For all our ZFS file systems, we scrub our data twice a month at least.