I believe (and someone should correct me if I'm wrong) that the micro-USB port that the Kindle 2 uses for charging is a standard for both the shape and the amount of power coming through it. So anything that uses the micro-USB charger is going to be just fine.
If you're talking about a Kindle 1, I think that uses a mini-USB not a micro-USB, though I don't know as much about that because I just have the K2.
You could also charge from a computer with a USB port by just getting a USB->micro-USB adapter, which might be cheaper, but would take longer to charge.
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