Can someone shed some light on blades for porcelain,granite and marble,please? I need to buy a new blade and I'm looking at a MK-415 or I've seen where some favor the Pearls.Do you get less chipping smoother cuts with the thinner blades or the visa versa?Or does the width have nothing to do with it and it's just a smaller kerf and less material loss? Does anyone know of specials or good deals ,they are proud of these even with internet pricing where I've been looking.