Actually I don't see the advantage of RAID 5 over RAID 1+0 (not that there aren't any... 1+0 just seems simpler and has all the redundancy you'd need). Not that that's entirely relevant to the topic... which reminds me, sorry about all the OT in your classifieds thread Juice!
I'm more concerned with not having data only on a single drive to protect against drive failure. If the place burns down, then I'm just screwed. That's what renters/homeowners insurance is for; I'll have a pretty sweet multi-site data storage setup v 2.0 after I get that fat lump-sum check.
And if users can't figure out how to map a network drive, they probably don't have a pressing need for strong data protection.