In my search for cheap but quality lenses I just picked this up from Ebay, a Tokina 300mm F/2.8 AT-X SD II.
I've been looking for this AF version of the lens for many years, most that appear are the Nikon AIS mount, I've only seen one other Canon EF lens. The lens has a full metal construction with a durable coating, a 112mm filter and a click stop tripod collar.
I'm pretty happy I walked away a with mint version at a good deal of USD 1250, as I could never justify the price of the canon EF versions.
The lens is very sharp at f/2.8 but as normal with does better at stopped down.
Just a grab shot using the Canon 7d at f/2.8, more examples to follow