Im looking for some advice for lens purchases/upgrades to my D7100. I currently have a nikon 50mm 1.8D and a Tamron 90mm macro. I sold my kit lens (18-105 VR). Looking to upgrade from the kit lens for a good all around lens. Which would you reccomend? Nikon 17-55 f2.8, Sigma 17-70 f2.8, Tamron 17-70 f2.8, or nikon 16-80 f2.8-4 VR? Any other lens suggestions are also welcome. I found a 17-55 f2.8 locally but Im confused about the manufacture date. The sellers says its 6 years old and a US lens, but according to Nikon Lens Versions and Serial Nos. it appears to be made in Japan between 2003 and 2005 making it 13-15 years old. The condition is great, but I worry about the motor in an older lens. Maybe I am being too cautious? I can purchase it for $500. I am also looking for a fast zoom/telephoto lens around the 200-300mm focal length. I was looking into the nikon 70-200 f2.8 or the 80-200 f2.8 but I’m unsure how these will do on a DX body. If a full frame lens will work nicely on the d7100, that would be a plus for future camera upgrades. I’m open to any lens suggestions other than the 2 listed. Maybe a Tamron? Thank in advance for the help!