The PRS customizer hack also allow you to change the fonts on the device, which is great as you can pick your favorite font for all your books. I use Garamond.
I think the PRS-505 is the best alternative for you, as it has the best build quality of all the reader (all the case is aluminum), and if you are not gonna use Amazon's whispernet, the K2 huge price premium and its bulky keyboard push it down.
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