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if you can get close enough, then your best bet is 85mm f1.4 but that's not a cheap lens either ~1100. you can also spend $400 more and go for the 70-200 f2.8 with VR.
i would just use iso 1600 and use noise ninja. unless you find yourself doing this type of photography and have the money to spend on the faster lenses.
Ya. I have CS2 and its pretty good with cutting down grain. I'm going to shoot next week @ a game.