* Takaichi, 64, beat all-male challengers to lead ruling party * Investors wary of her expansionist fiscal plans * A heavy metal fan, her nationalistic stance may make noise * She has pledged to increase number of women in cabinet By John Geddie TOKYO, Oct 4 (Reuters) – Sanae Takaichi came out top in a male-dominated race to lead Japan's ruling party on Saturday, putting her on course to emulate her hero, former British leader Margaret Thatcher, and become her country's first female prime minister. The fiscal dove's surprise victory may jolt investor confidence in one of the world's most indebted economies, while her nationalistic positions could stoke friction with powerful neighbour China, political analysts say. She has also raised the possibility of redoing an investment deal with the

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