[gulluwing]

I already own a tablet but I would like an e-reader to use on the beach to read pdf ewspapers.
I read that these devices would not be a good solution to read pdf but installing koreader display improves.
I'd like to know:
- For better vision and faster reflow of pdf with koreader it is preferable to kindle (the cheaper version) or for kobo touch? Or is it better to opt for higher models?
- is it possible to read a newspaper?
- After installing koreader can I reset the device to factory version to restore the guarantee?
Thanks a lot