I think for the extra 300, it may be worth the 200 2.8 L...its a pretty sweet lens and I think if you're doing sports, that focal length is a must have~
I have a media pass for the particular campus. The guys I work with did fine last year with the Nikon 35mm f/1.8 and kit lenses. I'll be pretty close to the action, plus it's not a paid gig with the school, so I'm not big on dumping more money than is needed. Thanks for the suggestion, though.