Lens suggestion?

Hello, I was looking for some advice on what lens I should get for Travel photography.
Camera/Lenses:
D80 (10MP).
Just got a 10-20mm lens. Other lenses I have are 50mm/f1.8 (x1.5 for digital), 28-80mm (x1.5 for digital), 70-300mm (x1.5 for digital)
I would like to take some good pictures of Fall color, and ideally, get a few shots worthy of making enlargements.

Since I did not have a wide angle lens, I recently bought the 10-20mm Sigma f/4-5.6 (for Nikon body). However, the 10-20mm lens is not sharp and is producing images that are somewhat fuzzy. This occurs even when I use the tripod. After taking 150+ shots, I looked at the pictures carefully and found this problem. So I am returning it.

What lens do you recommend I should get?
Two that I was thinking about are:
1. 18-200mm, Nikon or Sigma
2. 24-85 mm, 3.5-4.5 Nikkor

Thanks, appreciate the help.

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