Looking at getting the DMT 325x Dia sharp for my Norton stones, which is 4"x10" for $90. Economically, I would prefer the 600 which is 3"x8", for $52. Which do most of you prefer? I assume the 600 will still do the job, although maybe a bit slower. For just maintaining a flat surface, will the 600 not do just fine, or should I stick with the 325?