Seems likely that it's either Luffy or Zoro. I select Luffy mainly because there's too many unknowns involved in choosing Zoro. We don't know what his mastery of Haki is, we don't know how much his abilities have grown, and frankly, we just haven't seen him go all out. Against every opponent thusfar, including the movie, he's been able to take it pretty easy. Until we see him go full throttle into a fight with all he has, we can't compare him adequately to Luffy.

I think the author set the Strawhat Pirates' power ranking as..

1. Luffy
2. Zoro
3. Sanji
4. Franky
5. Robin
6. Brook
7. Chopper
8. Usopp
9. Nami

Though 1 & 2, 4 & 5, 8 & 9 are about the same.

well i was thinking if it was a battle royal, who would come out alive.

i picked zoro because him and sanji are like the only ones who can hurt luffy, assuming no one else can use haki and he seems to have grown alot.
i also thin that zoro would have an advantage because he uses swords and doesnt even need haki to hurt luffy.

definitely luffy..........hehe hhe he

Well from what I've watched Nami has playfully beat the crap out of everyone up there ^^^ besides Robin xD so I picked Nami

That question makes me think of rock, paper, scissors - everyone has got a weakness.
Brook for example could put Luffy asleep immediately...

Luffy all the way.

Who the hell picked Nami? Is this a joke?