So why upgrade to a professional quality Nikon D3? I have always yearned after a fully professional camera body. The Camera is ideal for my uses. It can shoot in low light without flash with its exceptionally low noise capabilities at high ISO's - great for family photography. Together with my Nikkor 50mm f1.8 and Nikkor 70-200 f2.8 this enables me to shoot in low light and still get good results.
Most importantly the D3 brings with it high quality images for my Landscapes. It may only be 12MP vs 10MP (D200) but this is the pinnacle of 12MP cameras. The full frame CMOS sensor clearly shows improved details in my own prints. Mega Pixels are not the be all and end all of image quality. Due to the larger, less densely populated sensor there is little noise. The detail the camera extracts from 12MP is fantastic.