Which one is the most value added car?Toyota,Ford,Nissan,Chevrolet,Ford,Suzuki?

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I am very excited to get a new car very soon.I have saed money like anything for this day.And I want to make the best use of it.So my friends here,can you help me in taking my decision.My budget is $15k and I want to go for new car from any japanese brands or chevrolet/Ford?Now at this point I am looking for suggestions as to the most productive and cost effective car .