Hi there, I've been searching and reading for weeks but I still can't decide which kit should I get. I'll start shooting professional football but with my current kit (5D III + Primes) thats not really possible. What I can't decide between is a 1D3 or 7D and 70-200mm 2.8 + 1.4x or 300mm f4 IS. 7D and 1D3 are between $850-1100. A 70-200mm 2.8 and a 300mm f/4 IS are also between 1000-1500. Thank you!