>The max shutter speed is more crucial for shooting outdoors >in bright light with fast glass. I have run into a wall when >shooting at f2.8 or larger and the shutter speed can only go >to 1/8000 and I get an over exposed image. I have to close my >aperture. You will run into this situation more frequently >when you are limited to 1/4000.
I have shoot in bright day light with my 50mm f/1.2 wide open, the trick is to put a neutral density filter to allow slower shutter speed.
I can't really decide between the D600 or D800. To me the $900 is a small amount considering it'll be an investment that should last for at least 3 years. At $300 a year, I'm so inclined to take the D800 for the better AF. However, a computer upgrade is guaranteed if I choose the D800 which would be another $1500!