I wouldn't be influenced by the big long ones, if you're going to be rugby and motorbikes, you need to be looking at the speed of the lens. No lower than 2.8 imo. You'd get away with 200 2.8, or 300 2.8, and fit a 1.4 or 2.0 TC when you need more range for planes. Best of both worlds. Anything less than 2.8 will cripple you for sports.