After much deliberation, I've decided I don't want to be walking around shooting in New York with a conspicuous, white lens. I've read New York is really safe but I don't want to risk it. I also want a wider reach than the 70mm end would give me. I decided the 24-105mm f4L would be the best option so started doing some research.
Since I'd no longer need my 24-70mm f2.8L, I listed it to sell on a couple of sites. I've had some bites but no one wants to spend what I'm asking. It's a near-new lens (I've only taken a couple of hundred shots with it) and I am meticulous in caring for my equipment so I figured dropping it almost $500 made it a bargain.
The reviews for the 24-105mm are good and the price wasn't too bad - I could get it new for $1250. I figured I'd wait until the 24-70mm had sold before I bought it and, if it didn't, I'd take my 70-200mm overseas and adjust my shooting to suit. Then I saw the exact lens I wanted advertised on a Facebook second hand camera page.
The guy was wanting $600 so I asked a couple of questions, got the answers I wanted, but was still set on buying a new one. Buying secondhand is a gamble and I wasn't sure I wanted to spend the money on something that could turn out to be a lemon. Then he dropped the price to $300. I decided the opportunity was too good to pass up so met him, tested the lens and bought it. I haven't found any problems with it thus far, and will test it a lot more before I head to New York. If all goes well, we'll both be heading to New York later this year!
I don't suppose you want to buy a 24-70mm f2.8L ;-)