if you had $1000 (sory for no conversions but i am in a time strap) a flash definityly but what lenses would you get say you were shooting mostly low light sports, but some higher light work
i shoot competitive climbing mostley indoors wich is a nightmaer photgrapicly with dust and bad lighting, but i also shoot a bit out side , and it is mostler low stuf like 85mm is about as much zoom as i want
Remember that the crop factor does not actually increase your focal length, it only reduces your field of view to be narrower.
It sounds like you want a 70(or 80) to 200 f2.8 constant to me. They're very versatile for the money and work well for sporty type stuff where you aren't too far away.