Hello, I'm looking for a few "rough" stones to round out my 1200/6000/13000 set from Stu. I've had to use the 1200 to reestablish a bevel a few times and it has taken forever. I'd appreciate suggestions for stones carried by either Stu or Lee Valley. Also, If anyone has experience with the cerax 320 or sigma 400, please feel free to share your thoughts.