J.K.
My daughters both go to Sterling Classical in Leander. It is a wonderful school with 2-3 days (depending on age of student) on campus and 2 days of home school. The home school aspect is very well laid out, so not scary at all. Check the website (www.sterlingclassicalschool.com) and there is a calendar on the right of the screen where you can scroll down and look for the next informational meeting. We have lots of folks who drive a decent distance to get here. I'd love to answer any questions you might have.
I've also heard great things about Round Rock Christian Academy, but don't have personal experience.