Both are equally good kits. I think the D70 lens is a little better but haven't used the Canon's so take that with a grain of salt. To catch fast moving objects you're going to want to invest in your first piece of big $$$ glass. On the Nikon side, that would be a 70-200 AFS VR zoom. Super fast (aperture and focus speed) and with the 1.5 crop factor, you're shooting equal to 300mm. Canon has an equivalent lens and is just as good. If you're in that price range you could also buy a Nikon D2H really cheap as the D2Hs has been released. I think it's at half it's original price. It's only 4MP, but man it's fast. I use one as my backup camera and like it a lot (along with a D70, third back up lol).

Shaun Bell