So far the 180 is doing a good job. You will have to AF fine tune it but it is really good at F4 going down. 2.8 is good but that extra stop helps. I need to get back out again to get some decent images to post but so far it's doing a great job and easy to find used at like a 650 dollar price. Which is a nice break after buying the 35,85 and 14-24. It may not match the 70 -200 which I have not had a chance to compare the two side by side but it is good.
I actually thought about renting the 70 -200 for a day to test it out