I need help choosing a 70-200.

As others has said already, since you're on a budget you are better off going with a used lens than a new one. There is nothing wrong with buying used. Just make sure you are buying from a very reputable vendor on ebay. Or buy it from craigslist, that way you can actually test out the item before paying it. I bought my 24-70 2.8 from craigslist, I even brought my laptop to do a quick view of the images before paying the seller. Not to scare you, but I did buy a lens on ebay which had issue. But paypal had no issue issuing a refund and the product returned to the seller. A lot of others have already suggested what to purchase. It is best to wait for items that are up for bids instead of buy it now, as you can usually get better deals.
 
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