You shoud cross ak with some paradise automaria, the paradise is not to potent but 350g per plant then ak is potent and somewhat high yielding so i want to expieiment. But thats just me.
From experience, I can tell you two strains NOT to waiste your money on. Pakistani Ryder and Auto Afghan Kush. I think they are both from world of seeds. A couple of strains I've "heard" good things about is the auto AK, Diesel Ryder and Low Ryder II. I'm sure others know a bit more. Just stay away from world of seeds autoflowering strains.