In fact in a few years the Leica was replaced but SLR and in 2 years time I was using a Nikon F.
Ok if kazbatus is on a budget I would recommend a S/H D700 but not a D600
If kazbatus wants to make money from photography, he needs a camera that will blow the soaks off the competition and that camera is the D800
Lewis Hamilton did not learn on drive on an old banger
just my humble opinion
Most F1 drivers drive go karts first.
By all means buy a D800 if money is not a problem, but it doesn't seem like you were all that accustomed to a D7000 before you decided to go FF.