I think any of the brands you mention are fine DSLRs. However, since you take a lot of action shots, you may want to consider a camera that takes image stabilized lenses. Why? Because, unlike a DSLR with in-camera IS, your view will be stabilized when you look through the viewfinder, making it easier to follow and frame a shot.
Don't underestimate the quality you can get from a
newer image stabilized kit lens; they will be designated as VR on Nikon cameras, and IS on Canon lenses. They are much improved over the same focal length lenses without Image Stabilization. So whatever DSLR you buy, just make sure it has the latest version of a lens.
I have a Canon XSi/450D and think the lens is terrific, sharp and produces excellent color, clarity and image quality. I have some photos in my pbase gallery posted here:
18-55mm IS Kithttp://www.pbase.com/gailb/xsikitCanon 55-250mm IS zoom lenshttp://www.pbase.com/gailb/55250A DSLR should be perfect for your needs, and the high ISO performance is
so much better than compact cameras that, for some shots, you may not even require a flash.
All the best on your purchase.
Related reading;Why buy a DSLR?http://www.digicamhelp.com/buying-guide/camera-types/dslr/Things to consider before buying a DSLRhttp://www.digicamhelp.com/camera-logs/dslr-dilemma/things-to-consider/Should you buy a kit lens?http://www.digicamhelp.com/accessories/dslr-accessories/should-you-buy-a-kit-lens/
Canon 55-250mm IS zoom lenshttp://www.digicamhelp.com/camera-logs/canon-xsi-450d/canon-55-250mm-is-zoom-lens/