Steve's right, buy the best glass you can. Canon lenses are dearer but generally good quality, L lenses are the mutts nuts. If you're buying a lens remember that you'll have it for a fair few years so spending that bit extra is worth it.
For wide angle I'd opt for the Canon 17-55mm or the stock 15-85mm both IS. I have the 17-55 and rarely comes off the camera.
Second for the motorsport Sigma 18-200 is a good bet, also for the rich and famous the Canon 70-200 f4 [some reckon one of the best lenses ever made for the Canon]. The 70-200 is pricey though. Alternatively, Canon 70-300.
In quality terms I would go Canon, Sigma then Tamron. Not saying Tamron are rubbish, just build quality aint as good as the others.
Just my tuppence worth.
Ta
Roo
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