The 18-200mm is great if you just want a versatile lens. If you want better image quality or need larger aperture then go with the more expensive lenses. IMO (and this may be just me), if you do go the multiple lens route, I would have some over lapping in the ranges. For example, go with a 17-35 or 17-40, the 24-70, and then 70-200.
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