I also want to use the 220/1000 for sharpening knives. I'm taking a course for sharpening and I will need water stones for that. I will probably need more than a 1000 for that so I thought I would buy the combo, unless I can use the DMT for the bevel on the knives ( I'll have to see where I take the course).

Will the DMT d8c be enough for the higher grit hones . The person I talked to at Lee Valley suggested using the stones in progression for flattening: flattening the 1000 with the DMT and then using the 1000 Norton to flatten the 4000 etc.