Octane: I don't understand the obsession with who manufactures the sensor. Looking at the DxO tests Nikon has 6 cameras in the top 10 list. Canon, who makes their own sensor, has one in 10th place. And that one camera is their most expensive one, while the D600 is the most affordable full frame camera today. Nikon is smart, they pick the best from different suppliers and put it together as an amazing camera. That's what made the difference for them in the past 6 years where people thought they were hopelessly behind to now being the top quality SLR producer.
Shame its always about problems when it should be about the enjoyment of photography getting enjoyment and mastering the camera improving your photos etc. The D600 is a nice camera to use i like it, cameras are complex they are small there not a PC where you play around inside the more you cram in the less space its going to be less user repairable.