[sunreader]

Hi,

I am looking for an E-reader with the following qualities (from important to less important):

1) The most important features I am looking for is the ability to annotate e-books and save the annotated ebooks (NOT only the annotations separately). The annotated ebook should be in an open format (I want to be able to read the annotated ebooks on my computer). As far as I can remember this is possible with the moon+ reader android app. So an open android e-reader would be an option. But I am open to non open e-readers.
2) Has to be lightweight (<175g).
3) Should have a hard plastic surface (I don't like the rubber like surfaces)
3) If possible, a decent screen to body ratio (lots of screen, not so much body/case)
4) It doesn't have to be 6" but since I want it to be lightweight, I won't get anything bigger and that's ok.
5) Would be neat if it would not be too expensive (< 150$ and/or widely available used)

Thanks!