For USB 3.0 Expansion Card i would say purchase the one in first link it has 2 years protection plan for $1.67 and it has better features like Low Energy Consumption.
The external drive and docking station looks good it all depends on what you need tell you the true.
When purchasing a hard disk drive Revolutions Per Minute (RPM) is important higher its faster the read/wright head of the drive can access the data on the drive. The 7200 RPM is very good speed.
The RAM cache size is also important because portion of RAM used to speed up access to data on a disk.
Speed of the SATA drive is important as well, SATA revision 1.0 (1.5 Gbit/s, 150 MB/s), SATA revision 2.0 (3 Gbit/s, 300 MB/s), SATA revision 3.0 (6 Gbit/s, 600 MB/s) speed.
I suggest you purchase Solid State Drive (SSD) they are much faster.
Thank you again FreeBooter for your help. Thank you for checking out the products and giving your input on them. I appreciate that, helpful! For backups or image backups, I don't think it would matter if it was 5900 rpm. I will explain further. For the main drives I use on a daily basis, I can say yes, 7200, but these image backup drives will not be hooked up to the computer until I am ready to make another image backup. With that said, what are your thoughts? Also, if the price is right, I will consider 7200 rpm ones for image backups.
The reason why I haven't bought SSD drives is because they are way too expensive and I feel I don't need them at this point. If they were the same price as the HDD's then I would consider.