Check this
Nook, Kindle DX, and Sony Digital Reader Touch Edition comparison table maybe it will help you to make a decision.
This is a conclusion.
- Kindle DX has a biggest screen size.
- Nook & Sony Digital Reader Touch Edition has a touchscreen keyboard while Kindle DX only has a Qwerty keyboard.
- Sony Digital Reader Touch Edition is a lightest e-reader among this three.
- Kindle DX is a biggest e-reader.
- Kindle has a best screen resolution 1200*824 pixel
- Kindle has a largest 4 gb memory.
- Sony Digital Reader Touch Edition has a longest battery life – 2 weeks (no wireless on Sony).