Need Recommendation : Reader.

Planning to start reading again after quite some time.

What's the simplest(cheapest) reader can I go for?
-Should not strain eyes.
-portable.
-Don't need any fancy feature (not even WIFI or market place)
-I do already have epubs of most books that I want to read.
-Should be able to bookmark
-while a built-in dictionary & light would be great, its not a necessity.

Dont want to get something higher end unless I get:
- Improved pdf experience.
- Hassle free way to read manga/comics. (mainly manga)

A few years back I was following Fisheye Placebo webcomic and author went on hiatus for sometime.

On facebook page or somewhere I found she was working on some start up and she hurt her arm/wrist with extra work.

I can kind of relate to her now when I'm working extra with office and my personal manga reader app.