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Matt, IS on 17-85 is no big deal it's once you get up in F/L that the IS is important. I had the 17-70 Sigma lens and didn't miss the IS.
FWIW the IS on the 70-200 is a different beast to that on the 17-85.
The IS on the 70-200 has 2 modes. In mode 2 you can set the IS to only work in one plane, so IS is useable on panning shots. As Dennis has already pointed out it's very useful at the long end of the range, and particularly so if you like to shoot in natural light.
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