Strength - Offers armor, but doesn't that generally do the same thing as points in Vitality? Armor means you don't die, the same as extra health. With health globes being constantly dropped, I would think this stat grows more inferior to Vitality by far.
Intelligence - Offers magical resistances. I'd give the same general argument as Strength for this stat.
Vitality - Good when health globes are abound. I'd say this stat reigns over Strength or Intelligence, except I don't yet know how much of a problem magical and physical attacks become as the game progresses. Maybe health globes drop less often in higher difficulties, causing these two stats to reign priority over Vitality?
Also, I've seen Hatred regeneration on some quivers. I'm just wondering how sexy this stat really is? While running around to farm XP, this seems to make kills easier and faster. But what about when you need to spam damage at a bulky boss or rare monster? Not worth the slight regen, or still yes?
Let me know what you are doing with some of your level 20+ Demon Hunters so far, and why you choose to pick your stats. What sort of benefits are you getting?