tamron 28-75 f2.8
For the price used 300 or so for the older screw driven on FX a screaming deal.
Get a good copy and at least for the center of the frame pretty good! Is it close to 28-70 or 24-70 nikkors not really but for the price and size impressive!
I have to admit had it for a few years for both D700 and D3s, but in the end graduated to the 28-70 than the 24-70. Before I tasted the nikkors thought it was good enough, but I'm spoiled now
A few good reads on this lens:
Nikon 1 J1
Nikon AF-S Nikkor 16-35mm f/4G ED VR