Next month I will fly to Berlin, then cruise down the Elbe River to near Prague with stops along the way. I don't want to take equipment I won't use but don't want to miss taking the correct photos. I plan on taking the D3 with the 14-24, 24-70, 70-200 and the D300 with 18-200. Do you think I will really need the 70-200? I would welcome any advice you may have. Thanks in advance.