While not as lightweight as the original Kindle Oasis, the larger screen, more durable aluminum chassis and full waterproofing are important upgrades that put the new Oasis at the top of the e-reader class.
The Amazon Kindle Paperwhite is a great ebook reader, with a built-in light that makes for clear, comfortable reading, even in the dark. Buying books direct from Amazon is a breeze, though there's still no support for the popular .epub file format.
The Kindle Voyage is Amazon's best e-reader to date, and probably the best e-reader ever -- but it doesn't come cheap.
This is the best ebook reader in the world right now. Providing you can spare more than £100 to read books, you won't be disappointed.