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Hi Ian,
OK, we've got a better picture of what you're up to now. For your work, your landscapes and your impending trip to Nevada I think the Sigma 10-20 will be a great choice. I've no experience of the Tamron 18-270, but it looks like a winner and a great walk-about lens. I would cautiously suggest that these two may suffice until your finances recover.
You could also consider a 'Nifty-Fifty'. A 50mm prime or either f1.4 or f1.8. This is a fantastic lens (I'm more than happy with my f1.8) and very inexpensive. It works well for portraits and if you want to do some macro with it, look at close-up lenses or extension tubes, then graduate to a 105mm macro later. I guarantee that even if you change all your other lenses in the future, you'll always keep your nifty-fifty.
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