Choose Seagate (PCX Php5,770) or Fujitsu drive. Then like what others have suggested, just buy an enclosure.
Check the enclosure before buying. try to see if you can modify the enclosure such that the HDD would "float" inside the enclosure. Don't attach the HDD to the enclosure using screws but instead, put little rubberized foams (see pic below) at the sides of the HDD. Those foams will serve as shock protection.
Here's an example. (from Logitec)
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