Worldview studies, in my opinion, might be the most important focus that one can have these days. It “armors up” your kids to face the world and all the nonsense that they are bombarded with.
Thanks for the rec on the “Universe Next Door”.
I recommend Summit Ministries’ “Understanding the Times” book. Noebel (author) also has a shorter version of the material in a book called “Thinking Like a Christian”.
One thing about the Universe Next Door - he doesn't include the Islamic worldview, though he is working on that, and will include it in the next revision.
I don't know how old your children are, but a neat college I just heard of is George Wyeth University. They teach American statesmenship, which they describe as the type of education the founding fathers had. It looks interesting. They have a website: http://www.gw.edu/