Apex is good, but no diploma, and I cant remember if they do transcripts or not???
But it is a rigorous great program, matter of fact K12 still uses them, but does not admit to it.
Veritas PRess Scholar Academy is 1/3 the cost of K12 and very rigorous and great program, they just got accredited and offer diploma program and transcripts.
Keystone is not bad, just not great teacher involvement, if you have a kid that works good independently it will work.