Well I'll add that I LOVE my 70-200 f2.8L IS. It's an absolute beast of a lens, and I KNOW that I'm not alone in that assessment. Yes, it is a top of the line lens and nearly all pro Canon shooters have one in their bag. I have no idea how it compares to the Sigma lens. I have no idea when the IS kicks or any of the other techy stuff like that. I was actually waiting for someone else to post that because I know several others here have used some of the other versions of the 70-200mm lens. Perhaps they could help out with how much the IS affects low light shooting. As far as the monopod vs IS argument, I would personally get the IS just because you'll always have that stabilization with you. It's also one less thing to pack/forget at home. That said, I have no idea how much more the IS version of the lens costs, and I have no idea if you already have a monopod or how much you're looking to spend on one. Hope this helps...
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