Are there any really good Supernatural/Grey's Anatomy crossovers out there?

Gotta take a moment to be picky; I'd really quite like the story line to be John/Izzie and that the boys and John found out that John was sick and checked him into the hospital under a fake name Denny Duquette. Bonus brownie points if John (Denny) still dies.
But it is okay if it's not that! Though would much prefer is to be Izzie/John.
Also, I'm terribly anal about this and I feel horrible asking it but I'd like really good recs. Stories where the plot is strong and in-character.

Self-pimping is very much encouraged as is slash, het and wincest (outside of the Izzie/John relationship, if applicable)

And as it's late at night I really hope that made sense...
Thanks in advance lovelies!