Sorry to jump in your discussion - I own Canon 60D and 17-55 ( also 50 f1.8 and 100mm f2.8 macro). I only recently bought 17-55 as a part of my upgrade of 18-135. Now I am looking for the long side : undecided between:
Canon 70-200 f4L IS
Sigma 50-150 OS
Tamron 70-200 VC
Do you agree that Tamron would be my best bet? 1. f2.8, 2. new with warranty, 3. black colour - I can at least see those 3 advantages; the price should be the 4th one I think.
Do you have any photos taken by the Tamron please?
You can't go wrong here. The 50-70 wide end is nice for crop portrait range, the f4 is light weight, and the Tammy is 95% of the Canon 70-200/2.8 II for 2/3rds the cost. You need to prioritize your needs and pick one IMO.