I agree not to take it, but if you must, the 70-200 is what I would go with. I always think of the room and how large it is, it's very difficult to get close up to people and actually get a good, candid shot of them without them noticing. That, and with the 17-40 your stuck taking pictures of people from 1 foot to 10 feet away (9 feet f coverage), while with a 70-200 you can get from 15-40 feet away (25 feet of coverage). That was rough, bad math but you get the jist.