In my case I'd go with the K4. I really like the buttons on my K3 and will stick with them on my K4. I really don't need sound, touch, etc.
Memory is not what I need. I perhaps keep 6-8 books in my Kindle. I add as I need them.
Battery life is not a selling feature for me. I don't go away from electricty for six weeks. Plug it in when needed, like a dustbuster.
It all comes down to your personal prefrerences. Amazon has a complete list of features, so compare. In the end, if you like to read, you'll be happy with either.
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