I know that buying another electronic device is sort of the opposite of "minimalism" but I've been thinking about purchasing an e-ink ereader so I can read without the temptation of flipping to different apps. (I have migraines and poor eyesight so the adjustable text size is a must; the print in most paper books is too small for me to comfortably read for more than a few minutes at a time.)

I'd like to avoid Kindle, if possible. What's good? Kobo? Something else? I'd really like something waterproof so I can read in the bath.