My choices for the top 3 are: Kimberly (the one that sang What's Up), Sawyer (the hippie kid), or India (in that last video posted)
I'm sorry to be saying this, but Josh reminds me too much of Dave Matthews in a lot of ways, and I don't want a semi-clone to win.
Koryn. Well you already know what I think. She's mangled almost all of the songs I've heard her sing in one way or another, so I'm missing something everyone else seems to be raving about.