This is the quality you see in magazines. Lpi means line per inch. Photographs are broken up into halftone dots. The higher the lpi, the more shades of gray can be printed and the smoother the photograph will appear. Newspapers are typically 85 lpi, black and white magazines are typically 133 lpi, full color magazines are typically 175-200 lpi.
Docutech output is a good option here, depending on the quantity.
Docutech is a high speed digital copier that outputs at 600 dpi. It looks a lot like the output from your laser printer, and its costs are comparable to regular copying. Ok, so I lied. I can think of another way to approach this kind of project. You can output the text on your laser printer, and then just gang the photographs that go into it on a negative.