If things are going well, then I'd generally say stick where you are.However, given that you're asking the question, you're obviously not entirely happy. The question is then to what extent do you want to work for a Big 4 firm in order to arrive at a specific goal, and to what extent do you think you "should" do it.You could do worse than arrange a conversation with E&Y and then make a judgement as to how much you'd be losing and gaining by walking away from your current situation.