They can all be used overseas. Some require a bit of slight of hand to download books from the sanctioned website. All of them can have books side loaded on them.
If you are looking for a an ebook reader that you can buy books from the sanctioned store (Amazon, Borders, B&N, Sony) then you should check each devices availability.
I checked the K3, it is saying that it cannot be shipped to Singapore and that you cannot buy Kindle books in Singapore.
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