What book should i read!?

I really liked the "Chronicles of Narnia" and the "My friend Flicka" trilogy. what book should i read next? please!! i am out of good books to read! I really LOVE animals, especially horses and my favorite book i have read so far is "The Magician's Nephew" (the 1st of the chronicles of narnia) I am a Christian too. What is your favorite book?