I believe the top curriculum would have to go to "eclectic" since in our experience, virtually all families build their own home educational broken using a collection of text books, websites, programs, and creativity. Here are some of the most popular building blocks.....
A Beka - traditional workbook Christian.
Alpha Omega LIFEPAC
Bob Jones University - BJU
Calvert - Highly respected homeschool curriculum from a homeschool school.
Math U See - Only for younger grades and math. New & well marketeed
Robinson - Independent religious curriculum.
Saxon - Most known for their math - Part of Harcourt.
Singapore - New entrant. Just math. More for the gifted than average.
Story of the World
Time4Learning - Online learning system, PreK-8th.