Tamron makes a 70-200 f/2.8 that runs about $700 USD. Excellent sharp lens. A little slow on the focus, so if you plan to shoot sports with it be aware that you definitely can, but the focus is slower than a non macro lens. It served me exceptionally well for weddings for several years. I used it heavily for portraits also. I truly loved that lens, but needed the faster focus as I am shooting sports.
Sigma makes a 70-200 f/2.8 (NON OS VERSION) that runs about $800 USD. I have no PERSONAL experience with this lens, but I do shoot with a woman who has it. It too is a macro lens so it's a bit slower, however she shoots sports with it and is pretty successful with the focus. She does say she misses a shot or two here and there because of the focus, but otherwise it's awesome. I do know her images are beautiful and sharp with it.
Sigma makes a 70-200 f/2.8 OS (the equivalent to IS in canon and VR in Nikon) that runs about $1400. It's not a macro capable lens and the focus is definitely much faster. It's also much more silent than the Tamron (can't say on the other sigma's volume.) I personally use this lens for everything except macro and I LOVE it. It's OS (VR/IS) so I can use it with slower shutter speeds and no shake. It's sharp and just absolutely amazing for a grand less than the name brand version.