DPI is a screen and printing term. Dots per inch. It has nothing really to do with the images in your camera. Even the lowest can run at 300dpi at size and look good.

72 DPI = Screen Resolution
172 DPI = Newspaper images (highest quality papers) Keep in mind that most newspapers now have ink optimizers that cut down on the dpi on the plate so they use less ink. So newspapers can print 100 dpi on some plates and 172 on others. DPI is just a term for formatting images for internet use 72-120 DPI and formatting for printing.
200-300 dpi = most trade magazines
300 dpi = high quality printing


Also, if you have a printer capable of printing higher than 300 - you can't see the difference, even at 600 dpi. The only reason you would ever print at high DPI is large format imaging and only if you shooting with a FF camera.