I am only really familiar with GCP, and I am not very fond of it. Our church is about to start seriously looking at what we do in Sunday School, and I am wanting to know if there are any curricula out there with the following characteristics: 1. Reformed (including no representations of Jesus); 2. each year builds on the previous year; 3. K-12th grade; 4. substantive; 5. orderly in the presentation of the whole counsel of God, not flitting about from one subject to the next. 6. unified in its approach to the theological disciplines (not just exegetical, or just systematic, or just historical, or just practical, but including all four as inter-related and inter-dependent disciplines). 7. possibly classical in its approach of grammar-logic-rhetoric. 8. somewhat challenging, but not frustratingly so. Anyone know of anything like this out there?