Why buy an external USB 3.0 hard drive? They are horribly expensive. For the same money, you can basically build one yourself with a purchased OEM HDD and an external enclosure. You still retain all the of reliability but with the added bonus of being able to actually swap out the hard drive, if needed. Plus, you can actually pick and choose a style that suits you.
I'll admit that I am still relatively new to the realm of hard drive enclosures. Previously, anytime I needed to access anything from spare drives, I would pull open my computer case and attach it to my motherboard. USB 3.0 has currently swayed my views. The speeds have shown me that I no longer have to worry about doing anything like that in order to get the maximum benefit from my hard drives.
The Vantec NexStar 3 Superspeed 3.5'' SATA to USB 3.0 External Enclosure is another beast in the Vantec line of products. This NexStar 3 Enclosure supports 3.5" SATA hard drives up to 2TB in size. The looks of this 3.5" enclosure keeps it in the same style of NexStar products with the black aluminum finish. The included USB 3.0 ensures maximum speed, as well as backwards USB 2.0 compatibility.