I have to agree with these recs, in fact I really love these stories! I can't help but notice though, that a few of my top favorites are missing. I hope this is just because you haven't come across them. Not because you think they're bad, or something!

Pretty much anything written by seamagik, and wildsky's Before I Sleep trilogy (http://www.fanfiction.net/s/2435280/1/Before_I_Sleep_Chimera) (epic length).