I want to pursue some photography, specifically sports. I am a college student and have a very tight budget. I want to buy one for cheap...aka 500 hundred. I have been looking around for a couple of days and I really have no idea which one I would like to buy. Both the Nikon D3000 and the Canon Rebel XS look decent, but I am hoping someone could spread some information on which one would be the best.

As I said I intend to use it for sports, basketball, running, soccer, ect...

Thank you.