I looked up the discussion from last year, it is in the Flash section entitled "Pondering which flash to buy" http://www.nikonians.org/forums/dcboard.php?az=set_threaded_mode&forum=154&topic_id=59255&prev_page=show_topic&gid=59255#59256 You may want to read through the advice I got. There would be no real difference between the flashes recommended for the D3100 vs D5100.
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