I think an AC adapter can be great: you won't be able to read while charging it from the USB, but you will be able to read when charging it using the adapter.
I find that most of the time when I'm at home I usually read with it plugged in so as to save my battery life.
Since PRS-600 is being sold in some European countries (UK, Netherlands etc.) you might be able to find an EU store that has it (and save on shipping and duties).
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