What camera suggestions, or what is required to shoot photos that will be professional quality at POSTER size when printed ?

I realize then you would also need a large format printer. Capable also of resolution 200 dpi or even better 300 dpi for sharpness. Sorry I am having a Brain Storm. I seem to be prone to this.
Update: No Camera Suggestions ? Or how to do this 20 X 30 size photography, with a professional outcome ? At least normal poster quality like you see, I would like better though. I have used film cameras for decades, Digital is new to me. I HAVE a 14 megapixel DSLR, but, megapixels do not mean much. It is more the CAMERA.
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