What is the best straightener for a person with natural spiral curls?

My hair is extremely curly naturally and when i straighten it later is turns kinda puffy and it curls up by itself after some days so it looks straight and curly with me doing nothing to it. Any advice??

This is me with my natural curly hair and i just finished straightening my bangs: http://it.tinypic.com/r/jztixw/5

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