If you didn't like the zoom on the 17-40, I'm not sure if you would like the 24-70mm. If you think about it, the difference is not that much (about 3 steps or so) and you lose the wide angle end (which may or may not be important to you). If you want more zoom I would recommend the 24-105mm like Soni said. The 70-200mm is a good lens but how often will you use it? Of course if you're okay with the zoom on the 24-70mm then go for it. I personally wouldn't go for a telephoto unless you have a specific need for it (at least for now).
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