[Gorwingel]

I would have to say Gollum, because the Balrog was very amazing and all, but it was an easier creature to do using CG. I was very worried about Gollum though, because from the first scenes that I saw in FOTR I was worried that he would not be a believable charater that I could watch for the entire film and believe that he was really there ineracting with Sam and Frodo. He blew me away! there are actual times where he doesn't look CG at all, he is very cool.