I am in exactly the same frame of mind as you! I have been watching the auctions on Ebay for about two months and I have noticed some slippage in price for the D1X.
What really concerns me is the out of stock condition at B & H and Adorama. Yet some smaller mail order houses seem to have an ample supply. B & H and Adorama are smart and I am thinking that they maybe hedging a bit until after Photokina. I will buy a Nikon D1X, but if Nikon does pop with a new model during Photokina you can bet the price of the D1X will drop, how much who knows.
I may be way off base, if so; someone is welcome to set me straight.