The next language arts program I tried was K12. I really liked it. It was thorough from a grammar and spelling standpoint, and there were a lot of interesting stories to read. However, again there was so much work involved, it just felt overwhelming. While I would highly recommend their phonics program (worth the price if you can afford it), I don't think I would use their language arts again.
PROS: very thorough, no scheduling required
CONS: very work-intensive - there's grammar and usage, spelling, vocabulary, plus phonics for early grades, plus literature. It's also expensive.