Lets say, for general walk around use while traveling. I tend to travel quite a bit, and always have my camera with me, but i don't wanna haul around a dedicated bag filled with extra lenses and stuff. I have the D90 with 18-105 Kit Lens. I have no problem selling it to buy something better, maybe the 18-200?? It would be nice to have some greater zoom capability. What would you do? Don't get me wrong, i love the versatility of a DSLR, but sometimes carrying 2-3 extra lenses is just not feasible. I'm just trying to figure out whats good for those grab and go moments, so you can leave the worries about which lens to use behind and go shoot. Im ordering a 50mm f1.8 too, so i'll have that with me when im traveling.