If cutting round blanks, a 3/8" wide blade (or 1/2" at a push) would help with cutting round bowl blanks etc. The experts suggest you adjust the number of teeth on the blade to the thickness of wood you are cutting and aim for three teeth in contact so for anything thicker than 1" a 3 or 4 tpi skip tooth blade is probably where you want to be. I have also used the M42 blades in the past and agree they are worth the extra expense. With a normal blade, if you hit a nail the blade is kaput but with M42, it will cut through with minimal loss of sharpness and will still be usable, probably for a considerable time!