Hah well I guess not being a 'videophile' is worth it for me, dealing with that much data just seems like a huge PITA. Then again that's what I do on a daily basis and anything less than a 200TB infrastructure-grade disk array is just janky basement shit to me (not worth spending much of my free time on).
In any raid set you need to leave them all running all the time or you will be wasting your time scrubbing and frankly risk the other disk failing. You will also loose the read performance bennifit which frankly you may need to rely upon if you insist at pumping that much data; a single disk may not be able to keep up. You will need a whole extra drive to back your main storage pool up.
Keep in mind with JBOD (no raid) you will have to rebuild the entire array if any of the disks fail. Just like cars, do it right, do it once, more movies and less 'wrenching' time.