I'm looking at upgrading from a P&S digital camera to an SLR digital. The two cameras I'm looking at are the canon digital rebel and the nikon d70. I really like my nikon coolpix 4300, but it doesn't take action shots very well. I go to alot of motorized sporting events, and the 4300 photos are usually very blurry. This is the main reason I'm looking at the SLR's. The canon is $900 and the nikon is $1300. I know the nikon is the better camera, but is it worth the $400 price difference?