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Hi,
I'm thinking of upgrading my Tamron 18 - 270mm Dii PZD Ultra zoom lens for the Nikon 18 - 300mm. The Nikon lens is sharper than the Tamron as a rule and focusing is slightly quicker due to the ring motor Nikon now use in their latest generation of lenses. However, in a recent super zoom group test in the N Photo magazine, the Sigma 18 - 250mm came out tops because is had the greatest optical sharpness over it's entire focal range than any other lens on test. Yes it may not quite have the outright pull of the 18 - 300mm, but it would be significantly better for focal range than your 18 - 105mm.
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