Thanks Chris. I don;t think we are going to FX for her any time soon so maybe I should try an 18-105, though she has a 70-300 and we both usually carry two bodies when we travel - she puts the 70-300 on her 7000 and the 18-55 on the 3100, so I have to check to see if the 3100 can drive the 18-105, or whatever else we consider. But that does seem like a good range for the Dx - good suggestion! A local shop will probably let us give it a tryout. D.