Mike has a bit of a discussion on using RAID for uncompressed editing. Mac-centric, but the same issues apply for the PC world. Mike links to a 2 reviews (here and here) of the Caldigit HDPro (US$8000 for 6TB). A little expensive, but one of his commentors points out that DIY systems can be put together for about 50% of the price.
Probably not particularly useful information for your next club VJ gig, but for those of us who are starting to edit in HD (and like myself, glancing towards uncompressed HDMI capture) the combination of high write speeds and data security are most beguiling. I’ll definitely be looking towards a DIY solution in the coming months so I can migrate from my current “bunch of projects spread across multiple hard drives and backed up occasionally” system to something more robust.