Welcome to MobileRead!
I've only seen the silver 505 so I can't really comment on the difference between blue and silver, but I can say that I've never had any problems with it. I get headaches when I spend too long using a computer screen but find reading an eInk display to be very much more like a paper book.
Good luck with the promo code - we can all sympathise with the wait to get your hands on your new device!
I'm sure whichever 505 you get you'll love it.
Just realised, should add that my silver 505 spends most of its time in a pink case so I don't see much silver!
|