Secular online schools or homeschooling programs?

My daughter is going to be starting 5th grade in the fall and we would like to try homeschooling. I am leaning toward K12.com but have not heard very good things about it. Mostly, that the workload is really intense due to busy work type worksheets. I've also heard that parts of it are inferior to other programs. My daughter is a hard worker and she said she isn't against the idea of working 6 days a week to keep caught up if needed but I fear it wouldn't leave time for her to do social activities. I've asked a few people who use K12.com with their children but I can't get anything out of them other than, "it's okay". Does anyone else have any experience with K12.com? Can anyone recommend a program that is better than K12.com I could research? I'd like to have some flexibility so I am open to the idea of purchasing a program('s). I'm in Washington state.