Any non-combat build for leveling a rogue is retarded.
Blade Flurry > anything in Assass/Sub tree for pve leveling.
Seriously, it's not even debatable.
You can level as Mutilate or Hemo if you want. But it's not going to be anywhere near efficient as Combat.
Ignoring the first 20 points of all trees since you can get those after the 41 points, this is what we can get from each tree.
Assassination: Cold Blood, Improved Kidney Shot, Quick Recovery, Seal Fate, Vigor, Find Weakness, Mutilate.
Combat: Sword/Mace specialization, Blade Flurry, Weapon Expertise, Aggression, Adrenaline Rush, Combat Potency, Surprise Attacks.
Sub: Hemo, Dirty Deeds, Prep, Deadliness, Cheat Death, Premed, Sinister Calling, Shadowstep.
Out of all of those, there is nothing from the other trees that can beat the pure grinding efficiency that is Blade Flurry + Adrenaline Rush + Sword Spec + Combat Potency.