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I would say do it. I've heard the 600 has bad glaring issues.
I have a 900 and have been nothing but pleased with it. It's very light and easy to read off of.
One of the specific reasons I bought the 900 was the larger screen. I, too, have eyes that aren't the best. Since I enlarge the text, the larger screen reduces the amount of page turns.
Good luck!
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