For photography, I am looking at this for a kit.
Canon 10-22 f3.5-4.5
Canon 24-70 f2.8
Canon 70-200 f4
If I am shooting indoors events, the 10-22 ans 24-70 will come along. You'll need to carry a good flash that can diffuse well (I love the 580ex) but those 3 zooms will be all you need for 90% of event/sports photography. Throw in a decent portrait lens, and you will be set. Substitute the 70-200 f2.8 and that can be your portrait lens, and your kit is pretty much done.
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