Per the Rowling, here are my picks:

1. Ron. Sorry, red. It's been in the mail for a looooooooong time. (You didn't really think the H/R romance was gonna have a happy ending, did you?)

2. Snape. Even if he killed Dumbledore on Dumbledore's orders, personally kills Voldemort, and is completely redeemed by the end of Book 7, the Half-Blood Prince ain't gettin' outta this franchise alive.

3. Lupin. If you assume that she probably won't kill Hagrid after icing Dumbledore, one would then presume that she'll take out the last surviving Marauder instead.

4. Hagrid. Let's not be assuming too heavily now.

5. One of the Weasley twins. Thus leaving the other to survive, a broken shell of his former humourous self. Fun, innit?

6. Neville. Plenty of drama in having him go up against the witch who fucked up his parents, and lose.

7. Molly. Almost too mean to be withstood by humans, but then, that's sorta Jo's style.

8. Mad-Eye. Sure, but who would notice?

9. Luna. Has the flavour of a "random kill out of nowhere" death, of the type that Joss Whedon would be proud, and Matty Price would revile. But then, he ain't reading this book anyway.

10. Harry Potter. Realistically he should probably be a lot farther up the list, but I've got a feeling about this one. I think Harry gets a Frodo, not a Ripley.