I voted for Michelle. I really think comparing her Olympic performance to Nationals is unrealistic, she should only be compared to Tara's performance at the Olympics. It was still a great performance, but she had peeked too soon at Nationals and Tara peeked at the right time, coming in as the slight underdog (at least in the media's eyes), and she came with the 3/3s. That unbelievable Nationals performance shouldn't so severely diminish her Olympic performance as it has. In fact, it was better than Oksana B.'s who also faced Nancy with 3/3s and a great skate similar to Tara's and won somehow.
I wanted to vote for more than one though, because M&D's Olympic Rach is my co-favorite pairs FS performance of all time (tied with Shen & Zhao's 2003 Worlds Turandot) and Paul Wylie's performance was amazingly inspirational. Cheers to all those named though.