This is SO hard.
Pro&celeb - I'm sorry I have to pick two. I can give good reasons though.
Ok the first one being Julian&Erin's showdance, I know a hell of a lot of people thought they shouldnt even have been in the final, but to me that last dance summed up everything about them that was great. They were so close, and you could see it in that dance. I think Julian even described it as 'the perfect way to say goodbye' [if it wasnt him that said it, it was Erin]. But yeah four years later I watch and still cry like a baby.
My second one is Austin&Erin's V. Waltz. I dont know what it is about that dance, I just think its pratically perfect. The music combined with the dance moves me everytime I watch, and it had such a definite beginning and ending. Yeah I love that dance.
Pro dance- Anton&Flavia [accompanied by Vincent&Erin]. It was just genius!
Special mention to Erin&Anton's dance to Andrea Bocelli in S5 though. I really regret the fact I dont have that on video, but to this day it sticks in my head.