I have the Nikon D70 and the sigma 70-200 F2.8 HSM . I really love mine.
I didnt relize how fast it was til i used my first lens a promaster i think 70-300.
It was very slow on focusing , so i quickly used my sigma, this is a football game by the way need speed.
Im still a rookie but love it . here are some shots indoor youth bball