I am really sorry to read that you are disappointed. I genuinely feel bad for you. People seem to have mixed reactions to the 600 screen at both ends of the spectrum. Some people love it and others obviously don't. With the new touch-screen technology on the 350/650, Sony appears to have improved the screen contrast and glare issues that bother you. There have been a few posts on this forum which include photo comparisons between the Pearl screens of the new 350/650 models and the Kindle which could give you reassurance.
I have really enjoyed my 505 reader. It has gotten good reviews for screen contrast. However, now that I have a Kindle 3, I can see firsthand that the Pearl screen has really raised the bar. Therefore, I think the 350 screen contrast would probably be more appealing to you than the 505.
Also, I guess it might be hit or miss if you buy a used 505? Might be in great condition or might be several years old / well-used and who knows how long it might last? The 350 also has more features with the built-in dictionary and annotation capabilities. If you have a bookstore nearby maybe there is a demo unit you could try for a hands-on test.
So putting on my analytical cap again, it seems that screen contrast and price are the two most important factors to you. Therefore it seems to come down to which of these 2 features is more important: the library book access (PRS-350) or 6" screen (Kindle 3)? I hope that helps you.
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