#9. "RE: Is the D700 the optimum upgrade path from D70?" In response to In response to 0
Robbie, You must decide if you need the main features that an FX sensor brings to the table. These include spectacular high ISO performance and a field of view matching a 35mm negative which allows you to use FX lenses the way they designed to be used. I'm not quite sure why you are talking about using the D700 in DX crop mode, since none of the lenses you list are DX lenses.