There are many outstanding storage companies out there but G-Technology has always impressed me with their speed, reliability, and pure aesthetics. My Thunderbolt G-Raid is set up in Raid 0 for maximum speed and daisy chained through my Thunderbolt Display. Smart previews in Lightroom also allow me to edit and/or export images at 2540 pixels on the long edge even when remote and disconnected from the G-Raid.
I then have a cheaper backup (Western Digital) for it since i'm never working off the backup (hopefully). Backup is then also stored in a fire safe and preferably off location.