Gotta suggest a classic: The Golden Compass, but the entire series. (Philip Pullman)
Another one: The Chronicles of Narnia -- C. S. Lewis
And if you're more into the mystery kind of thing: Liar -- Justine Larbalestier Or sci-fi: Strange Exit -- Parker Peevyhouse
Some randoms: Pretend She's Here -- Luanne Rice, One for the Murphys -- Lynda Mullay Hunt, A Night Divided -- Jennifer A. Neilson, Hush, Hush -- Bella Fitzpatrick (series)
I'll probably come up with more when I can see my book shelf ^^'