I'd recommend a Sigma 18-50mm EX DG 2.8 plus a Sigma 50-150mm EX HSM 2.8. Both are sharp and fast lenses.
But if you only need one lens, just get the Sigma 18-200mm EX OS.
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The sea, the great unifier, is man's only hope. Now, as never before, the old phrase has a literal meaning: we are all in the same boat.
-Jacques Yves Cousteau
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