Toshiba 20tb. I have 7 piece and I'm satisfied.
Data Hoarder
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If you can drop down just 2TB, Best Buy has 18TB EasyStore's for $199.
That's a really good price @ $11/TB, but I find it odd the 16 TB and the 20 TB of the same model cost more - $17.5/TB for 16TB and $20/TB for the 20TB
You just check the best $?TB ratio and warranty time. That's really all the things you need when choosing the drive. Also, remember that there are only 3 brands Seagate, WD and Toshiba to look for.