Big Storage for Video or Photography: OWC Ships Thunderbolt 2 Thunderbay
See discussion of the Thunderbolt v2 OWC Thunderbay IV over at MacPerformanceGuide.com.
There is also a RAID-5 version ideal for storing large amounts of video footage. One can also partition the RAID-5 version for photography purposes.
This is my unit of choice for my own storage; I have three Thunderbay units.