UPDATE: I loaded up Arma2 OA and have been able to play through the Armory with no issues at all. Rainfall, looking through binoculars, and even piloting aircraft over large areas of the map have not been able to reproduce the same crashing issue I have when playing DayZ. This reinforces, in my mind, that the issue I'm having comes from the 1.7.2.6 hotfix and not my GPU, GPU drivers, or my Arma2 config settings.