A whole stack of DVDs missing, hopefully this was just a simple mistake. From where did they go missing? Home or office? I find that in an office when someone "borrows" something, a polite email to everyone will make it reappear, though often it will reappear in a cabinet or drawer, so it seems that "I must have misplaced it." Yeah, Right. But at least its back. Well Good luck, and get some external firewire drives to go along with your next set of DVDs.
Im pretty happy with my storage solution right now, I have a two 1tb drives in a mirrored raid for photo storage, Its only a software raid, but seems to serve me well, and I also have another drive for my time machine, which backs up every night as long as I plug it into my laptop. The of course some DVDs, to keep at work. Really with the price of storage being so cheap now, there is no reason not to have a redundant backup system.