I would agree on dexterity being second most important, I would not agree on Constitution.For most characters dexterity and constitution are the second and third most important stats behind whatever your primary stat is. The number of Dex 14-16 adventurers is fairly silly.
You are going to get more mileage out of Wisdom, Charisma or Intelligence (in that order) then you will constitution, unless you have an abnormally large group or one that is focused more on combat than the other pillars.
I will admit that the optimizers tend to be focused on constitution as third (or more often second even) but they tend to be focused on combat and ignore the other scores and in many cases ignore the chance of being surprised.