I agree, Fire Muse - Cloud Climber just completely rules! That hair is just the most beautiful thing since Kimono, I'd say.
I haven't been on in awhile, so I'm only just starting to vote here, but I think I have to give my first vote to Wind Drifter. Mine had particularly beautiful curls in her hair when I opened her, so I must stay loyal to the loveliness. Although I do love yellow ponies...