I'll vote for the Brownells Magna-tips. In a former life (the one with a lot of spare time) I would custom grind blades to fit the job. They fit well enough but the fine blades frequently broke. The Brownells make life easier and less scary. They come in small increments of widths and thicknesses, can be ground a bit thinner/narrower if absolutely necessary. And they're tough. Regardless of which brand or type you prefer, the sooner you suck it up, toss the Craftmans, and invest in good screwdrivers the better off you will be.
