Mike: I've always used 7.5" spacing, but then I've always been in sandy loam soils. Your sales guy may have a point given your area and soil makeup. Either way I think the SM should handle more than 20, 20" blades. I've just bought a new disk 20, 18" blades and I'm disking in all conditions with my Farmall 130. Even today I got into some fresh plowing. I plowed down my rye cover crop yesterday, and hit it with the disk this morning. In this sandy loam the disk was running axle deep on that fresh plowing.
If I had a Super M, I'd be looking for a 28 or 32 blade disk for my conditions. You didn't say, but is this a 3 point hitch disk, your looking at. Those get quite heavy in the 28 to 32 blade size, takes a good size tractor just to pick the disk up. Might be wise to stay with 28 blade if 3 point.
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