<p>Canon 100-400 II IS. If you get a body that can autofocus at f8 in the future you can add a 1.4x III teleconverter and have a 140-560mm.<br>
Sigma 150-600mm Contemporary.<br>
Sigma 150-600mm Sports.<br>
I would not consider the Tamron. I own one (which I am going to sell) and the Sigmas are much sharper, particularly as you move away from the center.</p>