>>2269
I agree with tablets. I use a 7 inch Nexus 7 gen 2, and it works great. Unless you can get a reader for really cheap, you might as well get something similar, because they have a lot more utility.
As for which apps: I use Adobe for PDFs and EBook reader and Aldiko for epubs. Adobe and EBook reader let you take notes and highlight material, which is nice. I also use an offline dictionary called English, which works really well if you can't get internet.