Personally, I am very happy with my Kindle Keyboard. When both of them (I have a back-up) die and I can no longer purchase one through a kind person on this board or eBay, I will go to the Paperwhite. I have heard good and bad about the PW but for the most part, it seems that most people are satisfied with the device. Device wise, I don't really require a lot. It's great that the Kindle has Text to Speech but I almost NEVER use this. It is great that you can download MP3s onto the Kindle to listen to music while reading but I almost NEVER use this (don't want to take up to much space needed for books).
So from a device perspective, I am good - my Kindle does exactly what I need it to do - LET ME READ!
Now if there is one area that Amazon is sorely lacking in, it is the Collections functionality. They really need to find a way to enhance this significantly. Thank God for Calibre because this is how I currently manage my Collections and I have found for me personally, the best way to manage all of my books the way I want. I never understood why you would make a device that could hold thousands of books, but no practical way to manage the thousands of books on the device.
I know at one point we didn't even have the Collections feature - but now that we do, Amazon needs to put forth some effort to development this aspect more. Just my 2 cents!