Have any of you good people got any of the lens listed below fitted to your camera?
If 'Yes' then how do you rate them?
I'm looking for a one lens solution for my D90 and i've narrowed the choice down to the following.......

Tamron 18-270mm f3.5-6.3 Di II VC
Sigma 18-250mm f3.5-6.3 OS
Nikon AF-S DX Nikkor 18-200mm f/3.5-5.6G ED VR

What do you use and why?