There are plenty of fast e-book readers on the market, many of them smaller than 7″. If you are looking for something bigger, you should give the ONYX BOOX N96 a look. This is a 9.7″ E-ink CARTA+ e-book reader with built-in front light. It has touchscreen functionality and physical buttons.
The ONYX BOOX N96 has WiFi and Bluetooth. It has 16 GB of storage space and 3000 mAh battery. TF cards up to 32 GB are supported. You will be able to read PDF, EPUB, TXT, MOBI, DOC, and other popular text formats on this.