Here are three Top drives for mainstream digital imaging workstations.  Non of these come as standard equipment in off the shelf systems, but replacing drives in older machines with these will breath new life into them.

OCZ Z_Drive P84 and M84  PCI-E  SSD RAID

I love the speed and ability to migrate a PCI-E Raid Card to another machine.
I like SSD for Boot, Program, and Cache files, but the cost is overwhelming for storage of large file archives.

OCZ’s Site

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WD Velociraptor SATA 6.0 10,000 RPM Drive

It’s currently the fastest SATA spinning disk drive.  I’ve been successfully running Raptors and Velociraptors in SATA Raids for many years.  I use  Velociraptor drives  for large collections of working files.  I keep the images that I’m currently accessing on a Velociraptor RAID 0.  This dangerous but fast RAID is backed up  automatically nightly and periodically manually.

Check Price at Newegg

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WD Caviar Black SATA 6.0 Dual Processor 32GB Cache Drive

These drives come in 500 GB, 640 GB, 1T and 2T.

I like the WD Black drives for a number of digital imagining tasks; primarily storage of large groups of files that are worked on periodically.

These are good get SATA 6.0 drives for the price.   SATA 6.0 isn’t generally necessary, but does  offer  small advantages for building raids.  SATA 6.0 is backward compatable and the current prices at NewEgg are the same for WD Black SATA 6.0 OR SATA 3.0 drives.

Bench Tests at Toms Hardware

Check Price at Newegg