I suspect that image stabilization will have more impact on your eventual sports photography
While I love having SR, it doesn't do much for sports photography. It comes in handy when your shutter speeds are lower than you are capable of hand-holding the camera without camera shake. For sports you are going to have to use a fast shutter speed to stop the action, a shutter speed that would more than likely be fast enough to not show camera shake. If you are using a shutter speed that's slow enough to need anti-shake (like at a night-time football game) you'd end up with sharp grid lines and blurry players (I have just such a picture!).