oh, 1-2 meeters thats close. I really like the idea of the 10-17 fisheye and that effect seems to be popular when it comes to skating.... Not good for observed action shots thogh

more like posed ones. Yeah the 50-200 seems not bad, and since its outdoors the aperature is not a problem you would probably want to bump the aperature to give you some more slack when it comes to hitting the focus correctly anyway. I think the 16-45 seems like a good buy, seems sharp and I have seen it go for quite low prices.
If you are doing an event then testing and practice is in order, go find a busy skating ramp and give your lenses a run for their money and then you will soon realize if you need something new or not