I would say that the K3 fits your needs, save it has a 6' screen, so then I would recommend the DX.
The dictionary is very easy to use, just use the joystick and move it in front of the word, and a definition appears at the bottom of the page. The Kindle DX has a 9.7 inch screen, the same size as the Ipad. The battery can go up to two weeks between charges. The k3 is slated to have a battery that will last a month long.
Both of the latest generation kindles have the latest e-ink screen technology, Pearl, a significant improvement over the previous generation Vizplex.
Hope this helped!
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