The 7D with a 70-200 2.8 if my primary sports setup. While I'd love to have a 300 or 400 2.8, they are outside my budget. I borrowed a friend's 300 f4 and liked it so much I finally ended up buying one. It provides the extra reach for field sports that I was seeking. It is reasonably fast and very sharp. While the 300 f4 is a bit on the old side, it is still a very good lens. I've even tried it with a 1.4 II extender, and was happy with image quality, but probably not the best sports set up.