So I just purchased a brand new Canon 70-200mm F/4L lens. I know it's not fast like the 2.8, and I know it's not image stablized, but for the money, I think it's going to be worth every penny. I mainly bought it for zoo photography. I have a feeling I am going to need a 1.4x extender eventually, despite the fact that it will reduce everything one stop. None the less, it's still much cheaper than the 100-400mm.
Any advice on acessories let me know!