Likely your camera wouldn't take these pictures...
Most of the time I think that the best camera is the one you have with you. For most of us, the limits of our photography are in our ability to translate what's in your head to an image.
Sure I could use a better camera, sure it would help me make better pictures, but I don't believe I have come up to the limits of my camera as I have come to the limits of my imagination and ability.
That being said; THIS blog post could be made into an ad for the sheer mind numbing speed and ability to focus of the Nikon D3. Even if you don't read the post (which you should) just scroll down and see the mayhem. Very cool pictures, I hope the guy was okay.