I've been in need of a 70-200 for quite awhile now.. can't pony up the money for the nikon version(which I'd love to have)...so I've decided to go with the sigma and pray that I get a "good" version.. Now to my question.. Adorama has the sigma lens in a package including Tiffen filter's for the same cost as just the lens.. Should I call to make sure this isn't a graymarket lens or need I not worry and just buy it already.. I'm afraid of getting a bad copy and needing to send it back.. Will buying the sigma with the filter kit and goodies be a bad call if my new lens is in need of a return?