It seems publishing companies like throwing off the way our bookshelves look with all the cover reissues and changes they have been making to books. Also, international book covers are often different from their US counterparts. This is a meme that will showcase changes to book covers.
Hmmmm. I guess I would go with the US edition just because I have seen it in hardcover and it's all beautiful and shiny. The color of the girl's hair bothers me on the Aussie cover and the UK edition makes look like a ghost (I haven't read it, so I don't know, she very well might be a ghost!).