I think when we did the NF, we wore boots (I wore Nepals) the whole way in, and we went in the Rock Creek approach. Of course, Bob was carrying our camp gear back, so we had to show some consideration http://www.splattski.com/2010/borah/index.html
We had some real ice, but not much. I could have worn my Trangos easily.
I think the answer depends.... how comfy are your boots? How fast do you want to move? What's the hiking/cramponing split?
And like Bob said, wearing boots down COR isn't the worst thing in the world.
Sorry, no help from me.