Does anyone here own a D7000 and use it with either the Sigma 17-50 2.8 OS HSM or the Tamron 17-50 2.8 VC lenses? I am planning to upgrade my D80 to a D7000 and while I will be getting the 18-105 kit lens, I also wanted to add a 2.8 zoom with VR. I have a bad past experience of trying the Tamron 17-50 2.8 VC with my D80. I tried 2 copies and both had focus issues as well as F-- errors. So I am a little wary about non-Nikon lenses. I have the 35 mm 1.8 AF-S as well as the 50 mm 1.8 AF-D but a zoom has a lot more flexibility than the primes, specially for cramped indoor shots. Thanks.