I knew you'd have good advice, BlackElk :-).
Oberon, have you looked at the Hillsdale Academy curriculum - the grade school associated with Hillsdale College? They used to give away their grade-by-grade curriculum lists for free.
Because we're currently homeschooling, we have some curriculum in mind already. The curriculum we're using for theology, history, and literature is the Veritas Omnibus curriculum, which is fairly intense for an adult student, let alone our 6th, 7th, and 8th-graders.
So far this year they've read The Epic of Gilgamesh, the Codes of Moses and Hammurabi, R. C. Sproul's Chosen by God, C. S. Lewis's Till We Have Faces, The Oddyssey, the first five Narnia books, Genesis, Exodus, 1st and 2nd Samuel, 1st and 2nd Kings, and they're currently chewing their way through Histories by Herodotus. I know I left a few things out of the above list; I don't have my reference in front of me at the moment.
Their moms are covering math, science, and other subjects during the day, and we meet for three evening classes per week to cover Omnibus. Much reading and writing and thinking goes on. My daughter complained to me "Daddy, the other stuff we just had to learn. For Omnibus, we have to think!"
That comment satisfied me that we were on the right track.
Middle daughter is to graduate Hillsdale Academy in May because she needed more of a challenge than we can yet give her. It is a great school and covers grammar and high school. It is not Catholic but it is by no means hostile to Catholicism. Hillsdale Academy now has a DVD as well to introduce parents to its program.