I know I am chiming in late on this one, but I agree for a 200, I wouldn't bother with IS. It is containable at that level, and all it will do is drain your battery quicker.
Now, I am have used a 600/f4 alot in the past on the race course and I think it is a great thing to have, heck the thing weighs 12 lbs and is 18 inches long without the hood.... even the slightest breeze made the thing a sail. The wind kicking up a Sebring would blow me around no matter how hard I would try to keep it steady. With that type of equipment in those conditions, it is/was a great thing to have.
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