Choosing A Camera For...
What inspires you?
Since you're going to be using longer focal lengths, some means of steadying the camera is critical. A monopod is an excellent choice because it's easily moved and adjusted, and it doesn't tangle you up as you're panning and tilting with the action. Depending upon your location, you might find that a simple beanbag works well. You can set a beanbag-type support atop a fence and rest the camera on it, moving freely.
Another key accessory for the best performance is a fast memory card. You've undoubtedly seen the "x" factor on the high-speed cards. Figures like 40x, 60x, etc., refer to the card's write speed. While many compact digital cameras don't take full advantage of the maximum write speed, the SLRs definitely do. A faster card means less time for the buffer to dump to the card and less chance of a missed shot.
Early digital cameras took several seconds to boot up and get ready to shoot. That's precious time during which you could be missing the key shot, especially if the camera has automatically shut down to save battery power in the interim. Look for a model that has instant startup, like most of the current SLRs. These models are ready to fire as soon as you touch the shutter button even if they have to shut down for battery conservation.
Lens: A fast telephoto is ideal