I have been using a D600 for three years and I love this models price/quality ratio. Probably the best ratio in all, I mean, ALL Nikon cameras. Now the question here is: I though about getting rid of my second camera (D7000) and give the place to the D600 so I can get a better one for main camera. The bigger issue I am trying to resolve with this “upgrade” would be ISO related. I want a bit better performance and less noise at 3200/4000/5000 ISO. Apart from that, I really love the D600 and I think I will never give up on it. So now, that I want a better model without breaking my bank account, I am going with the idea that the D800 or DF can solve my problems. But the more I investigate and scrutinise all these models, the more I realise the D600, considering its price, is the better answer and the best Nikon model (excluding the Ds). Am I right? Should I just get another D600, or can I get better ISO performances with the D800 or DF? Thanks in advance!