Check out this link to look at the 100 best children's chapter books of all time.
http://childrensbooksguide.com/100-best-childrens-chapter-books-of-all-time
Best books by grade:
http://www.greatschools.org/cgi-bin/showarticle/624
75 great books that build character:
http://www.notimeforflashcards.com/2012/02/75-childrens-books-that-build-character.html
My personal favorites that I want to recommend: The 100 Dresses, The Giver, The Dot, The True Story of the Three Little Pigs, Holes, Number the Stars, The Harry Potter Series, Walk Two Moons, and The Giving Tree.
http://childrensbooksguide.com/100-best-childrens-chapter-books-of-all-time
Best books by grade:
http://www.greatschools.org/cgi-bin/showarticle/624
75 great books that build character:
http://www.notimeforflashcards.com/2012/02/75-childrens-books-that-build-character.html
My personal favorites that I want to recommend: The 100 Dresses, The Giver, The Dot, The True Story of the Three Little Pigs, Holes, Number the Stars, The Harry Potter Series, Walk Two Moons, and The Giving Tree.