You shouldnt use a 5D for sports so you should just trade it to me for my 40D and cash
I borrowed jimmy;s 300 2.8 and his 70-200 2.8
Your set up is legit for portrait photography but sports is a big no.
You can trade your 5d for a 40d and your 24-70 for a 70-200 2.8 and you would be set. but i dont know what you like to shoot besides paintball, i myself am trying to steer away from it!