There are four models available: the Amazon Kindle, Kindle Kids Edition, Kindle Paperwhite, and Kindle Oasis. If you're looking for a basic ereader, the original Kindle will serve you well. However, if you're wanting a premium model with a bigger screen, adaptive brightness sensors, and a sleek look, the Oasis is a great choice. For a mid-level value option, the Paperwhite is a great choice. It's perfect for taking on vacation or reading by the pool since it's waterproof.