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Item 3 is not a charger, so that's out.
If you travel overseas, the international version would be useful. Other than that, as long as they have over-voltage protection, you're good to go. You do get what you pay for, but sometimes it's just a well-known name... The Kobo, which can draw up to 750ma, will charge faster with a 1000ma charger than with a 500ma charger or a computer.
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