I really like the Australian cover :)
I love them both, and I think the girl on the cover of the the AU version is the PERFECT Kaleigh... but I LOVE the US cover. The colour, the kind of eerie feel and the darkness of it. Love them both, but the US cover looks magic to me ;)
I'm not actually sure which one of these I like more. The Australian one is more interesting but the American one is more pleasing to my eyes.