Welcome to the forums -- I don't think you'll be disappointed in the 505, but that depends on the sort of PDFs you plan on reading.
I've had my 500 for well over a year and I've loved reading on it practically every day (except for those books I wanted to read whose publishers are too shortsighted to have released their books in Sony format!) with no eye-strain or fatigue.
I came to the Sony from reading a lot of books on my Palm Tungsten T5 and the lack of backlight on the Sony is such a welcome relief!
Enjoy!
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