What is the best Kindle e-reader?

The Kindle Paperwhite has a resolution of 1024x768, which on a 6" display makes for a very nice 300ppi (similar pixel density to iPhones and iPads). The display is also backlit, which means you can read it at night. The lights won't bleed unless it's a very dark room,which is also less distracting than some competitors. The display also isn't glossy, which means you can read it outdoors without worrying about glare or other reflections.