Hell even AGI would be fine 1 AGI = 2 armor (I think) + crit/dodge (can't say how much for 1% at 85) and since STR doesn't give block value (since it will cease to exist) it could be close if they stop making straight up tanking weapons. If it is only on the weapon we could arrive at a point were the armor/dodge/crit trumps the AP from STR. (Also kings and wild? at Cataclysm will give +4-5?%) Who knows, we'll see I guess.
---------- Post added 2010-09-04 at 09:34 PM ----------
Rend = More damage from slow weapon
Devastate = More damage from slow (I think if I'm wrong you're going to blow my mind)
Heroic Strike= a cd and not on next swing so since it's based on weapon damage will benefit from a slower, harder hitting weapon so yes I think there will be a bit of a difference in aggro between slow and fast weapons
EDIT - Think the difference in aggro between a Frost Tank DK DW fast weapons vs DW slow weapons.