Best E-reader (e-ink only)?? PDF only...

[chinaboy1021]

What is the best E-reader? E-ink tech only please, LCDs strain my eye too much for heavy reading.

I only read PDFs (mostly assignments with math equations, diagrams, charts, etc.). Other PDFs include pure-text books, or text books (a lot of color, shades, bold words, illustrations)....

New to E-readers. Thanks

[Invader Gir]

I very much enjoy my Kindle 3G-WiFi. It was last years model before the newer ones came out. No backlight display for the screen and very easy on the eyes. Wifi and for a bit extra, you can get the FREE 3G version, but internet use is very limited for the device.