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I would look into a a faster lens, f2.8, which will help with low light situations and to some degree moving subjects. The motors in the L series lens are much faster to focus and quieter than what you have now. You're looking at about a grand to get into a 70-200 f2.8L. You could extend the reach with an extender but will sacrifice a bit on the speed and light situation as previously discussed.
I would also suggest upgrading your camera body. Maybe look at the Canon 40d, 50d, 60d, 70d, or 5d. You will benefit from increased shutter speeds, ISO, and frame rates. All of these will work with the benefits of a faster lens to much improve overall performance in the sports shots you want to take. I think you would also get a great improvement utilizing your current lens and just upgrading your camera body only.
What is your budget?
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