The Paperwhite may get the same annoying bright spots on the display as the Nook Glowlight gets when the screen surface gets dented. I am getting one mostly so I can test my code on it (not for reading
Here are some photos of what to expect from a minor light guide surface damage:
I am hoping that the Kindle Paperwhite has a harder surface and will not have the same problem as the Nook Glowlight. I will treat my Paperwhite with care and respect, just to avoid any possible problems such as that.
Just for reading, the $69 kindle seems like a great deal to me. It is even reported to have a much nicer screen (better quality control?) than the $79 K4. But only you can make that decision.