Strength gives you 2 AP per point, plus once you've got rune of the fallen crusader, that gives you 30% extra strength every proc. Stam is good because you're a melee class and things love to whirlwind and do other things to try to kill you. Crit, hit, expertise, and (to a lesser extent) armor penetration is also good. Try to stay away from haste somewhat, it doesn't benefit you as much as other stats would.