I have saw a video of a DX Graphite being used to read Manga and it was awesome. I would think that the 16 grey scale screen with better contrast would work better for you then the K1.
I have the K1 and the DXG and there is no doubt that the screen on the DXG is better. It holds 3,500 books so you should be able to store a decent amount of manga on it.
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