Rodolfo Paiz Offline Dedicated FM Upload & Sell: On
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Kind of depends on how you shoot the most, of course. It's not about how many millimeters of focal length overlap, but what percentage of your images are in the overlap area and which is the best lens at that focal length. If you're shooting between 18mm and 24mm a lot, you may find that the 17-55 becomes your primary lens while your 12-24 becomes a secondary lens, used mostly for 12-16mm range. Where they overlap, the 17-55 will run laps around the 12-24 without breaking a sweat... it is in an entirely different league of lens and image quality. The 28-70 really only makes sense to me on a D200 if you desperately need those extra 15mm or you're really seriously thinking about going FX in the very near future.
But I would guess that FX is completely irrelevant to you, and I suggest you ignore it entirely. Why? If I make the key assumption that your current investment in your D200, 12-24, and 50/1.8 fits your needs, budget, and level of interest/commitment, then FX is just too bloody expensive to make any sense. Your whole kit is worth less than $1,500 if you sell it today, while a D700 is about $3,000 for the body alone, and then you get to spend thousands more in glass to go with it. Meanwhile, there is still a whole world of glass in front of you, and the D300 as well, in the DX realm. So unless you plan to spend $6,000 to $10,000 on cameras in the near future, FX is currently irrelevant to your particular needs and profile, just like medium-format is.
Let me suggest an alternative: for less than the price of a 17-55, you can get a Tamron 17-50/2.8 and a Tokina 50-135/2.8. Those are both great lenses, with great reputations, and they'd get you a whole lot farther while giving you back a little change, even. But if it's strictly a choice between the 17-55 and 28-70, I'd say 17-55 all the way.
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