There are so many sweet kit deals on ebay for like $600-800 bucks. Some are 23 pc deals with the body and up 3 to 4 lenses, and a bunch of other stuff. Every kit I've looked at comes with a 1-year warranty. Original Nikon 100% new factory sealed. So they do not appear to be refurbs. Some do specifically say USA and some say imported. So my question is, what is the difference? Obviously the USA ones are more expensive. But why? Is the build quality different? What is the advantage to spending hundreds more on the USA version vs the "imported" one? Is it like a USA Fender vs one made in Mexico? I thought "grey" market were fakes or knock offs. How can this be if they say 100% factory sealed with a 1 year warranty? Please advise.