We love Christian Light Education (CLE), it is advanced and wonderful! I truly believe that it is the best L/A and Math curriculum there is. Of course not all children have the same learning style, but this is best for mine. CLE used the spiral approach and it is fairly inexpensive. Take note that it is put out by the Mennonite community and is rich with biblical references. You can find reviews here: HomeSchoolReviews.com Just search Christian Light Education.