Tony,
if the 20Da is like the other Canons, and like my Nikon, then the CCD chip gives a magnification factor of about 1.6x, so if you want wide (and I do) you need to think around 17mm to whatever.
In optics there is no such thing as a free lunch, ask Ponders. Gut feeling is try a kit cheapie first, at worst it will cost you a few dollars to find it is or isn't any good. As an all round hobby and snapshot lens it may do what you want. If not then figure some decent coin for the "L" series stuff.
As an aside I have the kit Nikkor 18-85mm for my D100, and it is quite good. Didn't stop me buying a film camera yesterday though, with a zoom (24-85mm) I love the digital stuff, but miss film as well. Weird huh?
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