This is a question that I am asked when people see my work. I will answer the question, but I just want to stress that a simple camera in talented hands will produce amazing photos and expensive equipment in the hands of someone who has no "vision" will render outstanding crap.
Although I was using 2 older Nikon bodies, a D300s and a D700, I recently decided to "upgrade" and acquired a D810.
My lenses are all made by Nikon and are top quality. Many times the limiting factor is the lens so it is important to have good "glass" especially with sensors of 16MP and greater.
I do not like "variable aperture" zoom lenses since they have much less ability to control light and depth of field. I have three zoom lenses, 17-35mm f/2.8, 24-70mm f/2.8 and 80-200mm f/2.8. I also shoot with prime lenses: 16mm f/2.8 fisheye, 50mm f/1.4, 85mm f/1.8, 105mm f/2.8 macro and 300mm f/4 telephoto.
This kit gives me quite a bit of flexibility and the ability to choose the right body/lens combination for the situation.