The 18-200 is versatile, but its image quality probably is on a par with the 18-55 kit lens (i.e., relatively low). Your 70-200 f/2.8L will definitely outclass it in every way possible, except price and portability.
If money's no object, I'd say the EF 24-70 f/2.8L USM or EF-S 17-55 f/2.8 IS USM might be the perfect "mate" to the 70-200 f/2.8L, but both of them also have four-figure price tags, like the 70-200 f/2.8Ls.
Do you have a specific budget and a specific thing you like to shoot?
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