There are 2 good size showrooms in Denver, one is Mike's Cameras and the other is Ritz.

I would love to know how you cleaned the sensor and got rid of the spots. My first D600 developed the oil spots and the camera store where I purchased it replaced it with a new camera. However the new 600 is having the spot problem, the more pictures I take the more the more spots I get.
You are right, it starts developing after about 3000 exposures.
thanks