how about the tamron lenses. there's the one thats as good as the 24-70 L from canon, think its a 28-75mm. can't go too wrong with that range I hear.
similarly for wide angle try out (if you can stretch to it) any lens around 17-35mm range.
canon do a 16-35 and a 17-40, sigma do a 17-35 (the one I have, its nice
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the smaller sensor on the dslr's at the moment is a little bit of a niggle to me, I have a nice range of lenses from wide to telephoto but if I were to want the same 'reach' as my film body with a digital one I would have to get 'even wider angle' lenses. that said i really see the value of dslr's...as a film user myself I can't wait for a larger sensor to trickle down the scale, otherwise I'm in for an expensive time!