Here's a wonderful LJ rec list from the glory days of fandom: http://alethialia.livejournal.com/416014.html#cutid1

There are fandom classics on that list that haven't been crossposted to AO3, so I definitely recommend checking out the fics and authors there.

Have you read real!Nate's book? It's wonderful and it made me amazed at how accurately he was portrayed in the show.