Congratulations on the upcoming purchase. I always have that feeling when I spend a lot of money on cameras...that kind of excited nausea.
If this is for business, it is a necessary expense. The D2x is in many ways on a different planet from the D2hs. I also think that it is a bargain at 5 grand. For us Canon folks, an equivalent camera does not really exist. The 1d Mark II costs less but has significantly lower res. The 1ds II is much slower (though it has other benefits).
I have been running on 20ds and have been very happy with them. I am seriously considering the 5d but I am worried about Reichmann's review. He basically called it a dust magnet (something the 20d is not). I have gotten very spoiled with the d30 class cameras in that area.
On another note, I would love to engage you more in the business forum on your landscape sales. Are you selling through local vendors or stock of some sort?