Ian, there are literally THOUSANDS of Khufu cartouches on the Giza Plateau. Walk through the western cemetary and you'll find one in nearly every tomb.
With regard to the pyramid itself - show me one pyramid built before Khufu's time with the name of the builder inscribed in it. The Great Pyramid sits perfectly in line with the evolution of Egyptian pyramid building.
You've only seen and read as much as you wanted to and with heavily tinted glasses I might add.