PRS500 is an old Sony reader. Sony is not even during any update for this version. in fact in August, they offered a $100 or $150 credit (don't recall the amount) to PRS500 owners who were upset and wanted to upgrade to a 505. Both 505 and 700 are the latest. The 700 is touchscreen and has a front light to read in the dark. But a lot of people are complaining about screen clarity. You can read about it in the 700 forum. my advice is this, get the 505.
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