While awaiting your reply, I did some brief research on GunBroker. There are two DK 1911s on there, one of the .38 Super PC versions like mine and a non-PC with no caliber noted so I assume it to be a .45ACP. The minimum bid on the .45(?) is $1,295 so a grand sounds good IF the two guns are in similar condition.
The .38 Super has a bid of $1,500 on it with a Buy Now price of $1,695. That is good as well as when I bought mine two years ago, I researched selling prices of the few that sold on the Internet and found an average of something in the mid-$1,700s and that was based upon guns that had sold at least two years prior to that.
It's curious how there are different versions of the same gun. The PC .38 Super and my gun are both PC1911-2s yet the front sights are different, the sale gun's trigger, while the sale type as mine, has three grooves in its sides while mine has smooth surfaces and mine came in an aluminum Performance Center case and the sale gun is in what is described as its original blue plastic box.
I think that if the .45ACP gun I see on GB and the one you are considering are of equal quality, I would make the purchase. After all, most non-replica high-end 1911s sell for that much and more. But first, I might want to better confirm that it actually IS a DK replica as I have to wonder why S&W's top pistol shooter wouldn't be using a PC gun. Anything's possible, however.
Ed