What about the Muses from Hercules? I was so excited when I first saw them.
Also Tzipporah from Prince of Egypt.
As for my favorite princess it would have to be Jasmine but she was an original so even with Tiana being made of awesome it'll be hard for anyone to take her place. I wished they showed more of Tiana's curly hairstyle looks that I see of her in the concept art though.
I found it funny how Pocahontas never wore any of the trademark "Pokahontas braids" though.
And Mulan knows how to BC in style. How many people can say they cut their hair off with a sword?