What do you plan to use the camera for? I have the 18-105 and am satisfied with it. The lens quality of the two combinations you list should be similar although the 18-105 might be a bit better. For me, I liked the range of 18-105 meaning that I could reduce the number of lens changes: use the 18-105 routinely and switch to a ultra wide-angle or longer telephoto if required for special circumstances. I would find the 55mm 'cut' between the 18-55 and 55-200 a bit limiting. But, with the combo, you do get some extra telephoto reach (which might be a big plus for you depending on your main targets).