This is a subject that has no exact answer.
Because no one agrees on the answer.

Here is just a snapshot of what you are asking:

Canon has a kit lens for the Rebel:
Canon - 18-55 f3.5 and sells for about $100
That is what Canon says is the all around lens.

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Here are other lenses that others select:

Canon 17-85 f4.0 with Image Stabilization - $590
Sigma 18-125 f3.5 - $220
Tamron 28-75 f2.8 - $320
Canon 28-200 f3.5 - S360
Tamron 28-200 f3.8 - $230
Sigma 28-200 f3.5 - $200

You have to decide if you want to favor the wide-angle end of the spectrum or the zoom end of the spectrum. Or something in between.

Do you want a bright lens (one that is best for low light situations).
The Tamron 28-75 has the brightest lens (f2.Cool of the ones above.

Then there is price/quality

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Most people go with the kit lens and after they use the camera for a month or so, they will know what type of lens they want.

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