This is a huge debate between Canon owners. The 24-105 has image stabalization and is longer. With IS sometime you can make up a stop difference. But only as far as sharpness. You cannot match the creamy bokeh of the large aperatures.
The 24-70L does not have IS. But it does have the f2.8. One might argue how much you need IS with such a fast lens.
I am having the same problem deciding as you are. I already have a 70-200 so the 24-70 would be a perfect fit. But I said I didn't want any more new lenses without IS. But I also said I didn't want anymore new lenses <200 mm without at least a f2.8. What to do?
For you, since its a first lens, I think I would get the 24-105 for the extra reach. BTW, the Canon 40D is supposed to come out September 20th.
Mike
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