Storage Solutions Buying 500 GB Portable HDD for my laptop

I'm getting myself one of these from the UK, and a 7200rpm hdd locally. this supports sata2, and my lappy has a esata port. It needs 2~3 USB ports to power itself if a 7200rpm drive is used, but I'm taking care of that too ;-)
 
What's the main difference between the Expansion and Go Flex? Just the aftermarket USB 3 connector? And the Expansion seems to be a little bulkier.

Also, has production of the Free Agent Go stopped?
 
Thanks Dipakshah, but this is an internal HDD. I have to put it in USB casing to use it with my laptop, which is not a good option and will cost me 500 more.
 
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