I just finished the second book in the FableHaven series by Brandon Mull. I really love these books and I think they are just as interesting as HP or some other fantasy that I have read recently. I also like them because they teach a lesson and they have discussion questions in the back of the book to help facilitate a discussion either with kids or for a book group. Its published by Deseret Book so there isn't the worry of something being inappropriate for kids.
I would say that if you are a parent I would read these books first to see if they are appropriate and not too scary for your kids. But I would highly recommend them to anyone who likes Harry Potter or any other fantasy type books. I really enjoyed reading both of these and I look forward to reading many more.