We recently returned from Ko Olina, also had a 3 BR on exchange, still cannot believe how nice the resort is and how nice our room was. We did not make any specific request for a room and were put in the Naia building on the 5th floor. That is within floors 1-6 and we were still blown away, I've attached a photo of our view. As far as I understand all the 3 BR's in the Naia have the same view, just higher or lower depending on the floor.
That was our first time, so can't say what Moana is like, but everything is so nice, I don't think you can go wrong.
Make sure you walk over to Secret Beach and Paradise Cove, monk seals swimming ashore and laying on the beach, lots of sea turtles in the cove, it was incredible.