I get where you are coming from - but I trade a little glare for having a much higher resolution + colour screen & am happy to read only in locations where the reflectivity is not an issue.
the aura HD is immensely frustrating when there's image or a map within a book & I cannot make out the details.
Yes - some times of image, in some formats, will zoom some of the time; but not as effectively as those in tablet apps. A double tap in Mantano will zoom any image.
with epub3 maybe not that far away, I am not sure that I'd now commit to an epub2 only, black & white only e-ink device & certainly not one with a fragile screen that is excluded from warranty. ( I read that Kobo used to replace failed screens/substrates in warranty but not not any more - I think Amazon still do though)
PS - bird-friendly is maybe another consideration. my old Sony devices were notorious for auto turning every page & finishing the book for me , because a budgie feather had landed on the touch screen
