Kindle Paperwhite...

... has what I've most wanted (and not yet found) in a Kindle: "Crisp, dark text against a brilliant white background." I haven't seen that yet, but it's enough to make me buy another Kindle... especially considering that Kindles are weirdly cheap, in this case, $119.  Also: "New Time to Read feature uses your reading speed to let you know when you'll finish your chapter." (Note: I get a percentage if you buy yours at that link... or buy anything after you enter Amazon through that link.)