Disk storage is cheap, but software like NR or layered actions requires a lot of horsepower in a computer. I upgraded to the latest I7 and a Samsung 512GB 840 Pro, and it finally handles the rendering of my old D800 images with all the NR I had to apply. I'd pass on a 75GB camera, but I can see some uses for one like landscape.
Canon lenses can handle the resolution, but it requires a lot of care by the photographer to prevent motion blur. You will need a much higher shutter speed for non-IS lenses, or a very stable tripod.