I'm actually selling a 135mm f/2 on B&S now, so I may not be qualified to give an opinion. That said, here's my two cents worth, and you can take it with a pinch of salt if you wish.
imouyang is definitely right in saying that the 70-200mm f/4 is a great lens. It is perhaps the best 'balance' amongst the three choices you listed. But your choice will depend on your uses. A max aperture of f/4 means that it will primarily be an outdoor lens. Compare this to the 135mm f/2 which is a whole two stops faster and definitely works well in low-light applications.
So if you like to photograph indoor sports, stage productions, seminars and the like indoors, the 135mm f/2 might fit the bill for you. Another popular lens for such applications is the much cheaper 85mm f/1.8. Don't forget about that too.
That being said, if you photograph outdoors and love zoo/ wildlife photography, both the 135mm and the 70-200mm take very well to a 1.4X TC. The TC can be used to extend the 'reach' of your master lenses and get you a more frame-filling photo.