For a couple of months now I've been going back and forth between Nikkor 24-70mm, Sigma 24-70mm and Tamron 28-75mm. I've decided to go for the Nikkor 17-55mm f/2.8 and so far on regrets. I own a D90, but a part of me wishes I've gone with the 24-70mm, but whatever. Anyone wanna share their 17-55mm experience? Photos? Has anyone bought the 17-5mm, but decided to go for the 24-70mm or any other lens after a month or so? If so, why?