Prices Drop a Little: Toshiba 3TB Hard Drives + OWC Mercury Accelsior PCie SSD
Fast and inexpensive storage
See the recent notes on hard drive warranties.
OWC has the very fast Toshiba HGST 3TB hard drive for $129.
While my capacity needs are better served by 4TB drives, the 3TB ones are very fast and a much better deal on a dollars-per-gigabyte basis.
Fast PCIe SSD
Prices on the OWC Mercury Accelsior PCIe SSD (what I use for my work every day since it arrived) have also dropped slightly, to $447.50 for the 240GB model and $699 for the 480GB model.
The Accelsior can be used directly in the Mac Pro, or with any Thunderbolt Mac by installing it in the Mercury Helios case.
See also How to Speed Up Adobe Photoshop Lightroom and Faster Workflow, Faster Lightroom, Faster Photoshop? and Huge Photoshop Files Need a Fast Working Drive.