So what exactly is the discussion to be had? Are you asking for advice on how to best keep it?
I have a friend who has a crap load of videos and such and you know how he stores them? E-HDDs. I think he has ~5 atm.
If you want to know what my future is going to bring me, as a gaming video maker and thus high-data usage:
My two SATA 6 ports will at one point have SSDs connected, not just one. Hoping to get that Crucial m500 1TB SSD that's coming.
$600 will make it a steal!
My four SATA 3 ports will all have at least 1TB HDDs, if not larger. 3-3.5TB would be nice. Do the math. 12-14TB. >
Then I have 2xMarvell SATA 6 ports that are supposed to not be that great, but if it comes to it, I'll use them too.
Then you still have PCI/PCI-E SATA RAID cards you can install for even more HDDs, but at this point, you have to make sure you have a case that can hold so many HDDs!
I also already have a USB 3.0 500GB E-HDD. :P