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From my experience, I think that Google's traffic has the most ROI, i.e. conversions of visitors to buyers. My judgement is based on relative terms of percentages, i.e. for any equal traffic from Google, Yahoo and MSN, Google's traffic is the most targeted and profitable.
Thus, if I were you, I would target Google as a target search engine.
However, you should always try to market to all of the three in case something happens with one of them, your business can stay awake.
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