Upload & Sell: On
Here's my plan right now. I found the LaCie Little Big Disk 2TB refurbished for $237. The Black Magic Speed Test on this unit is around 200-210mb/s. That's pretty good! I plan to connect the Little Big Disc to two iMacs simultaneously via Thunderbolt. And yes the Little Big Disc has two Thunderbolt ports.
In my studio there are two of us editing weddings on two different macs. Our wedding galleries are big, so we only keep one wedding gallery in LR4 at a time, and that wedding gallery goes right on the Mac's Fusion Drive.
The rest of my wedding galleries, which are yet to be edited, stay on external hard drives until it's their turn. I shoot 40 weddings a year, 1000+ Raw images per wedding, D800.
So the LaCie Little Big Disc solves a lot of problems. It allows me to access all of my wedding galleries extremely quickly, from two different Macs simultaneously. In the mean time, the wedding I am working on sits on my Fusion Drive, which is really really fast, like 420mb/s.
If you guys have a better/faster suggestion I would really appreciate it. The only thing I know that's faster comes from Pagasus, but those are $1000+