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Lingering in my mind always was to review if I can replace both my kit lens and 70-300mm G with a 18-200mm. Having read [this] and [this] rather conclusive review, I am wise to keep my kit lens and 70-300mm G lens.
The Nikon D90 as your first digital single lens reflex camera...and D300s as the successor...and the D3100 as a fun backup!