If price is no issue, the 70-200 f/2.8 IS is an amazing choice. But it is expensive, heavy, and a pain in the rear if travelling.
If you're not needing to shoot handheld in low-light, the f/4 version is considerably cheaper, lighter, and smaller and is still optically very good. Still bright white though.
I have heard that the 18-200 is a nice lens, although you sacrifice a little aperture. If you're going to be using it in daylight mostly, this is a non-issue. The range gives you fairly wide to fairly telephoto, so for a "walkaround lens" for normal lighting, this one seems ultra-convenient.
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