So: The Price of Magic isn't AU but it's very alternative. The Price of Magic spin-off, Commonplace Magic, *was* AU and I liked it a great deal. Then there wsa the one where Snape was deaf (it was handled well) [Edit: Sunday, by hidden_decay]. Now there's "The Dreaming Spires" which is pretty sweet halfway through :)
[spoilers] "I took a fall a few years ago and I don't remember much before that." A-HA! A-fucking-HA!!!!!!!!!!
Anyway, the Snarry Reader has a whole list of AU Snarry fics, so I'm off to explore.