Here is what I can tell you from personal experience.
first and foremost, if its too good to be true, it probably is.
Secondly, I have come to learn that when buying high end equipment, review,review,review. Never stop searching. I do this with every item like that that I buy. I even looked up info on the people whom I was buying my house on.
Hint: Google this phrase every time: "Complaints about______"
Usually, you will get an eyeful if it is there.
I purchased my KM 7D from Calumet, and yes it was a bit higher in price, but they also have a huge reputation to keep up.
Sorry for the experience, and good luck on finding a camera.