The Kindle Voyager fixes the biggest complaint I have with the Paperwhite: page turning via touching the screen is worse than the physical buttons on older-gen Kindles. And the auto-brightness sensor means there is one less thing for me to fiddle with. Higher DPI and thinner (flush bezel looks sexy!) are just icing on the cake.
It's kind of hard to explain why I love the Kindle so much - and why I've owned every model - but something just feels right to me about reading with it. It's modern but familiar and so much more convenient for me (click Buy Now on amazon.com and the book is loaded by the time I walk over to pick it up from the shelf).
FYI: I always buy the models "With special offers" (ads shown on the lock screen - but usually Amazon does a free giftcard offer during the first few weeks so free $$) and "WiFi" (I've rarely used the 3G - and you can always just tether to most phones nowadays anyway).