I second the motion for a second body. If you are shooting school events, fast and accurate AF is very important. I have a 1D Mk II and a 50D, and there's a massive difference (in my experience) with the AF. The 1D AF is still vastly superior. Heck, I'd even go find a clean original 1D and leave it mounted to your 70-200 - even the 4.2Mp sensor can produce some great images at up to 8.5fps for $400. Good 1D Mk IIs can be had for $900-1100, and their 8.2Mp sensor still produces a fantastic image - I use mine weekly for just about everything I do.


I would think as only one photographer with only one pair of eyes and hands, you'd be better off with two cameras around your neck (50D with 17-55 f/2.8 and 1D Mk II with 70-200 f/2.8) and get more of the shots you want to get. In the end, getting the shot is all that counts!