18-200mm is the most useful focal length range.
Now you need to decide what you shoot.
If landscape is the primary focus, then, get an ultrawide angle.
If sports/action is heavy on your agenda, then, get 70-200mm f/2.8 (Sigma or Canon, IS or no IS, depending budget).
If low light indoor is on your agenda, then, Canon 17-55mm f/2.8 IS, or Sigma 18-50mm f/2.8 or Tamron 17-50mm f/2.8, and Sigma 30mm f/1.4 and Canon 50mm f/1.4.
Now you need to decide what you shoot.
If landscape is the primary focus, then, get an ultrawide angle.
If sports/action is heavy on your agenda, then, get 70-200mm f/2.8 (Sigma or Canon, IS or no IS, depending budget).
If low light indoor is on your agenda, then, Canon 17-55mm f/2.8 IS, or Sigma 18-50mm f/2.8 or Tamron 17-50mm f/2.8, and Sigma 30mm f/1.4 and Canon 50mm f/1.4.
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