Before you commit to additional expense - why not rent the 70-200mm first ?
If it suits then by all means go-ahead and buy it!
Otherwise, you have only spent a little money on 'research'.
This is the best advice you'll get. Rent the lens from one of the good online lens rental business, and let the lens make the decision for you. If you post a "what do you think of this lens" thread here, you are going to get answers from one end of the spectrum to the other. For any given lens, there are those who worship it, and those who loathe it. Get the lens in your own hands and on your own camera and let it make its case.
| 


