On the K2i I just got, I've been using my HTC Touch Pro 2 charger which outputs 5v 1A to a female USB plug. I just use a microUSB on it instead of a miniUSB cable (the kind my phone uses). Though the power supply can provide "up to" 1 amp, the device will only draw what it needs. You can do higher amps, but it can potentially be a bad idea to do lower, if you put the device in a situation where it's trying to draw more power than the power supply can provide.
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