Hello Mini

Your best bet at a reasonable price would be a Canon 70/200, if this kind of shooting is you main usage you will not need IS as it will counteract panning .
If the light is good you maybe happy with a 70/200 f4 Canon which is very sharp too, if your budget is more consistent a 70/200 f2.8 is the way to go.
Tamron does offer a similar lens but the a/f is slow on it, not sure about the Sigma on that matter but the price is very similar to Canon with some kind of out of focus issues, so stick to the brand you will not regret on the long run and you won't have to stop down to enhance the sharpness