Here is the thing....there is good lit that my 9 year old shouldn't miss no matter the reading level.
Just the other week his class was divided into groups to read novels. DS had already read the hardest book. The teacher gave him the choice of the next book down group or picking a book by himself. He chose the book with the group...stone fox. He loved the book. I had recommended it to him many times and he had passed.
The only problem was the pace. Stone fox is like a short story to be read in one sitting to him...not some long drawn out novel to be read over a week or two.