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Z-Strain (Golden Teacher) is supposedly the highest potency.
I honestly haven't tried them, but I will say this: they blue a hell of a lot easier than most strains.
A lot of potency issues depend on when the things are picked, too, so watch for overgrowth (kills potency). If you have really potent stuff, 3.5g is perfectly sufficient. I tried 1.8g Amazonian with Syrian Rue, and got my head blown off, so definitely approach with caution. If you're buying from street dealers, though, then odds are the stuff isn't that strong.