I'm looking to go to Chicago at the end of March and thought I would ask some of you which lens I should stick on the camera. I have the Nikon 18-200 VR and the 50mm 1.8. With Chicago being as busy as it is, I'd rather not be changing lenses constantly with the hundreds of people walking by and possibly knocking a lens to the ground, etc... The 18-200 would be the most flexible, but, from what I've heard (and I just got it but haven't tried it out yet) the 1.8 is a pretty sharp lens. So, if you had to walk around with one of the two, which one would it be?