For me, the screen resolution is great on the 505 and good on the 600. The dictionary is nice on the 600 when reading 19th century novels. They used a larger vocabulary. It doesn't matter much with new novels in the last 50 years. The advantage of the 600 is the 5 font sizes rather than the 3 found on the 600. If you read books in foreign languages and need the dictionary to help translate, then the 600 might be an advantage. If price is an issue, then go with the 505, but Ebay prices seem to be holding in there more than might be expected. They both have mp3 players. Page turning seems easier on the 600. What do you plan to read is the question to ask yourself.
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