My suggestion is to go to the shops and have a look at the Sony Reader PRS-650 and the K3. Then you can make up your mind which one is best for your needs. After having a look at them, feel free to come back to this thread and ask questions about them.
You may find the touch screen of the 650 to be what you want or need. You may find the K3's buttons fit your needs. What fits your needs is a personal choice. So go actually have a look at them and see what you think.
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