I would base your choice on your next most likely lens. If you think a 70-200 may be in your future the 24-70L would be a faster lens and give you a very nice pairing. Plus it's more like the 28-70L you were originally going to buy.
I figured a pairing of f2.8 zooms was the classic kit IS or not, you would be hard pressed to have the wrong lens owning such a pair.[/QUOTE]
I already own a 70-200 2,8 

