Aegis Padlock 3

The Aegis Padlock ($190 for 500GB) is fast and brawny -- its USB 3.0 data transfers are nearly 10 times quicker than USB 2.0, and the built-in AES encryption chip (choose between 128- and 256-bit protection) is coated in epoxy, which can't be compromised without damaging the circuitry beyond repair.