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Striker,
I have the 25 to 105 usm, which I use on an EOS 5 35mm silver process body, and it's one of the better zoom lenses I've ever had, at least as good as the Nikon ones I've got. You'll find that no wide zoom except the very expensive wide zooms from Canon and upward (some minolta esp old rokor, nikon, ziess, lieca), are worth a pinch, and you'd be waisting the camera's ability to mate it with the really aweful Sigma. I find that the 25-105 and a 100 to 300 USM cover nearly all my vanilla photography needs, but I don't use the 100 to 300 that often. For family work, the 25 to 105 is the choice. You wouldn't want to use wider than 25 for portrature anyway, and you'll rarely open the 25-105 up all the way, appart from the odd landscape (really better off at around 80 and doing a mosaic which your canon software suite will have a utility for, even when buying a bare body).
I don't know the CCD size of the 20 DA, and that'll have an effect on any crop factor between 35mm lens focal lengths image fields, and the field of view on your body, but I still can't see the 17mm and up zoom being worthwhile for happy snaps, when the very good and much cheaper 25-105 will basically do it all (remembering that for portrature, most is done between 80 to 100). You also have a fairly reasonable chance of vignetting with sigma and even the canon at greater than 25 if the ccd is too much smaller than 35mm.
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