I am considering buying the D3100 and want the vesatility of a single all purpose lenses with the Nikon 18-200mm VR. I am occasional photographer and want simplicity in use vs highly technical model (I have D70 and have found that too much). My question is that with the 3100 being small and lightweight compared to larger size models is the 18-200 so much larger in size and weight that it is awkward and bulky mounted on the 3100? Also is it work paying more for the Nikon 18-200 vs less expensive models from other manufacturers with same specs and focal length? Thanks for your input.