I may be super late for this post, but if you shot and liked the 24-70 f 2.8 then get the Sigma 18-50 f2.8. Better image quality than the 16-80, much lighter, less expensive, and a good focal range. If you want more focal range the Tamron 17-70 is a good option, but bigger and heavier than the Sigma.
I had 2 copies of the 16-80 (good ones) and was not impressed (it's okay), but I REALLY like the Sigma.