If you prefer a zoom, I can't say enough good about the Tamron 70-300VC. Just another one to throw out there.
***EDIT - It may be too slow, especially if you're shooting indoor sports.
Definitely too slow for hockey and basketball, both in maximum aperture and autofocus speed. In my experience it hunts much more than the Canon 70-200 f/4L I used to own. A good lens for wildlife and portraits, but not so much for sports.
I'm a huge fan of IS, but it isn't usually necessary for sports photography. Especially on full frame, it is fairly easy to hold a 70-200 steady at the shutter speeds required for sports photos (1/500 or faster)