I agree with everyone who says avoid backlit screens for reading ebooks. For serious readers, Kindle, Nook, or Sony Reader are much easier on the eyes and can be read in bright sunlight.

I have been using a Sony Reader for years. I chose it over Kindle because it uses epub format rather than a proprietary format, meaning you are not limited to shopping at Amazon. Also, Sony can read pdf files which Kindle could not (this may have changed, I don't know.) Nook also reads epub and pdf and appears to be a good value for the price.