I remember seeing a table that showed different variations of the Model 19/66, how many rounds had been fired, and which guns had experienced forcing cone cracks. Many of the guns saw thousands of rounds before cracking, and some still hadn't cracked after thousands of rounds. In all likelihood, it will never happen if you shoot 125 grain rounds. I've also read that the Model 66 is especially resilient to this Achilles heel, as the quality of their stainless steel is higher than that of the blued carbon steel guns. It's not hard to find 158 grain loads either, or to shoot just .38 Special through the gun either.
I understand the paranoia though, and I'd just as easily vouch for a 586/686 too, as long as they aren't recent production. If you're relegated to recent production guns, the GP100 is probably the way to go.
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