The Sony Digital Paper is not billed as an e-reader, but you can most certainly read your collection of eBooks. This device can read PDF files and it is quite easy to download them online. If you have your own collection of DRM-Free EPUB, MOBI and DOC files, you can convert them to the PDF format using Calibre.
Sony has one of the most lush screens in the industry and their device is the most responsive when it comes to viewing PDF files. It is the only 13.3 inch e-reader that has an E-Ink Carta screen that is completely flush with the bezel and has a quad core procesor.