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I would also highly recommend a 70-200mm f/2.8. I have no experience with the Tokina 16-28 or the Sigma 105 macro. I would also look into the Tamron 15-30mm f/2.8, I've owned this one in the past, and it's such an incredible lens! I just didn't shoot that much at this wide of a focal length. Used ones of this lens are priced just slightly higher than a new Tokina 16-28. But, it seems like you'll be getting your bases covered. I've owned the Sigma 50 Art and the Nikon 85mm f/1.4G and they're awesome!