I'd like to hear about some 21" blades, specifically mulching blades. I have a 21" crapsman that I don't use too often, but when I do the cut is terrible. Since it's used so little I can't justify spending alot on a commercial unit. So, I've been looking at different blades. Was wondering if anyone has had any luck significantly improving the cut by switching to a different blade? Doesn't snapper make a "ninja" blade that is kinda like a "Y" at each end giving it a doube blade effect? Wonder if it's any good. Then sears has a few funky looking mulching blades with weird ends on them. Anyone have any input? Thanks.