The 70-200 f2.8 II is a fantastic sports lens, and is the way to go if you can afford it, and will only have 1 camera. It's also a great lens in general for almost any type of photography.
Soccer involves similar distances to American football, but play tends to move over the field much faster. There is no one lens that will cover it all, and no one place to stand to cover it all.
I shoot sports professionally (maybe semiprofessionally) including soccer and football, and I use a 400mm f2.8 IS, and the 70-200 f2.8 IS II, on 2 separate bodies. For shooting the actual game play, I will alternate between the 2. When the game stops, I will trade the 400 for something wide and shoot the player / fans / stadium with that and the 70-200.
I would not recommend the 100-400 because it does not focus as fast, or as well. In my opinion is a great wildlife lens, not a sports lens) Also in a night game, the f2.8 is critical. The 70-200 f2.8 IS II works great with Canon extenders, I'd go that way for more reach. And possibly add a 7D to your kit if you want to add a 2nd body.
All that said, don't feel like you have to buy V II or this lens, or the 300/400 2.8 (when you are ready for that) Version I of these lenses or even the non-IS versions are great lenses assuming you can get a used one in decent shape. I bought my 400 used for $4500, and the $8500 saved vs a new vII goes long way toward other equipment. It's nice to have the latest and greatest, but it's better to show off your awsome photos than your new shinny lens.C28F0143
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