I would have suggested the same, but if you want the real navigator veranda with the big open port hole and the special touches, you won't get them with these 4 cabins. If that's what you're looking for I think since they are all similarly close together it doesn't matter which you choose. The ones on the 5th floor are closer to the kids clubs and dining rooms. I like being higher and would choose one of the first I come to from the elevator.
I'm staying in one of the "regular verandah" but obstructed cat. 7 rooms in January - 6134. So it's just a matter of what you're looking for, that is if you want the "real" category 7 cabin or a regular style verandah for less than cat 5 or 6 price.
Karyn