> I made up my mind to go only FX with the Nikon system What the OP prefers is perhaps more important. I regularly shoot DX alongside FX. I regard FX as best for about 10% of my photography - mainly high ISO work - though in the context of D7000/D700 there is likely to be little or know high ISO advantage. I regard DX as best for about 20% of my photography - mainly for macro and long lens work. For the other 70% (D300s/D3s) there is no difference between the formats. Going FX exclusive puts the majority who shoot where DX is the best option at a disadvantage. Digressing FX corner quality wide open at the wide end on lenses like the 14-24 and 24-70 is someway from spectacular. Although the angle of view is different on DX the corners upgrade to close to spectacular
Photography is a bit like archery. A technically better camera, lens or arrow may not hit the target as often as it could if the photographer or archer does not practice enough.