The $499 from Andrews is non-pro version. I asked about difference to the pro and this is what I have been told:
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...we believe the ED80 uses FPL51 glass, whereas the ED80 PRO uses FPL53 glass. FPL53 is noticeably superior to FPL51 and I had seen the statistics and optical performance difference on the internet a few weeks ago in checking something else.
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Also make sure you get one with Crayford focuser.