Lense Recomendation?

[TrxR]

I just bought my first DSLR a Rebel XT. Anyways I am trying to figure out what lens to save up for. I am looking for a good zoom lens for doing wildlife as well as some motocross and drag race photos. Is the cheaper Canon EF 75-300 III any good? What about the EF 70 300 IS ? Any other suggestion would be greatly appreciated.

Thanks

[Canuck935]

For what you want to do I'd say you are better off saving up for faster glass. If the 2.8's are too costly for you take a look at the 70-200 f/4 as a cheaper alternative.

[Has He Lost His Mind?]

The 75-300 is a bit too slow, but if you up the ISO, you might be alright. If there is any way for you to rent that lens, try it out.