What do you guys think about replacing my Tamron 17-50 + Nikon 55-200 VR with the 18-200 VR (with possibly the 50mm f1.8 for lowlight)?? When I'm out and about, I'm starting to get pretty sick of swapping lenses all the time between my 17-50 and 55-200 VR. My other lenses are the Sigma 10-20 and Nikon 105 VR, both of which I consider more to be specialty lenses which I don't typically use as a "walkaround" and as such, doesn't pose much of an issue in terms of having to swap lenses all the time. The 17-50 however often feels too short when going about and the 55-200 often feels too long, which has up until now, required constant lens changes. Now I'm thinking about the 18-200, but not if I have to sacrifice "significantly noticeable" sharpness. I'm very much unsure about this because the reviews for the 18-200 VR seem to be all over the place. Some say the IQ is quite bad, falling short of the 18-55 + 55-200 combo, zoom creep, etc. Other reviews speak highly of its IQ and sharpness, no zoom creep etc. It seems user opinions are just as greatly varied as the reviews... and its really hard to determine the validity of these reviews when one says one thing and another says the complete opposite. So I'd like to hear what you guys think about the 17-50 +55-200VR vs. the 18-200 VR. Do you think I will notice a drop in IQ if i went with the 18-200? Will I miss the f2.8 of the tamron? Will eventually getting a 50mm f1.8 compensate for the lack of f2.8 zoom? Thanks all!