I selected a good external enclosure and a good hard disk. Then I put these together. Now I have five (5) sets of these external enclosures for backups and general data storage.
External enclosure: http://www.newegg.com/Product/Product.aspx?Item=N82E16817173042
Hard Disk: Either WD or Seagate - 1 TB
I tend to stay away from docking enclosures because of the mode in which it is used.