@firefoxxy: Your requirements scream "I want a Kobo ereader". epub support (among others), browser can download supported formats, plugboard support, collections from calibre, homepage shows most recent (plus library has good filters and sorting) and the details for the book can be shown from the library list.
For a 6" device, if you can find a Glo HD, that's the way to go. The recently released Aura Edition 2 appears OK, but they dropped the resolution back to 1024*768.
I can't comment on the alternatives as I have never seen them.
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