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i agree with senna that you need a 2.8 or faster. if budget is an issue the non-is version of the sigma 70-200 has some decent reviews, and with hsm it'll be more helpful than the tamron in low light.
gars is also right in that you get more return out of lenses compared to bodies, so if it's what you need now, it's not too difficult to move along as you can still get good dollar for your lens.
if you do this often, get what you need now and worry about the FF issue when/if it comes.
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