Ayumi Morita is extreeeeeeeeeeeeeeeeemely talented.. She's fast like the other Japanese girls, but has powerful ground strokes. They're really penetrating...she's really great to watch. She also has great hands and volleys verrry well. Her serve is weak right now (though she's only 15) but unlike Sania Mirza, it's a smoth and natural motion.
Shuai Peng could get there with better mental fitness and consistency...she's got the talent.
Sania Mirza has amazing groudn strokes (and a great personality) but her serve is just terrrrrrible and the motion is just awkward and hitchy. Her movement/fitness needs to improve dramatically as well. If she can improve those areas, she will definieitly be top 3.
Na Li,Tian Tian Sun, Angie Widjaja, Su-Wei Hsieh could all for sure be at least top 20, with health and a full schedule.
Go Ai, Venus, Na, Tamarine!