Personally, I've never believed a woman has to make a choice:
Pick only one of the above.
I've always been a believer that a woman should be her full feminine self at the office. I'm into what I call "feminine-ism" - which unlike some of the hardcore "feminism" I knew growing up- "feminine- ism is about being feminine and powerful both - in one tasty spoonful.
Hm. Notice which ranks higher on her list? It's unclear what her message is, because she says that women who are good will get promoted no matter what they look like (I'm not sure that's true) but then says, "if you're a business woman reading this blog -- remember -- cleavage IS power - and you must be aware of using your cleavage power responsibly!" Her advice subtly implies that women should dress sexy to succeed.