I am thinking of buying Nikon 18- 300mm for my Nikon D7000 which comes with 18 to 105mm and a 55 to 200mm. It is bulky and heavy to travel with these 2 lenses. What is your advice and where is good place to buy ? Buy online ? AF-S DX NIKKOR 18-300MM F/3.5-6.3G ED VR on Amazon is US$500 plus but on Nikon Singapore Website is $1069 . 2nd hand comes with warranty ? Is AF-S DX NIKKOR 18-300MM F/3.5-6.3G ED VR compatible with the D7000 ? Thanks