Ned, I am somewhat in the same spot. I generally shoot two bodies for sports. Right now that is 2 D3s. I had intended to upgrade them both to a pair of D4's. I had been using my D7000 as a daytime sports camera, and a studio/fashion camera. So now I am somewhat baffled as to how to do my upgrades.
Buying 2 D4's is one option. But it's going to be one HECK of a stretch to buy 2 D4's and a D800. The D3s is meeting 90% of my needs right now. So my current thinking is to buy 1 D4, keep the D3s in rotation, and buy a D800. I'd probably let the D7000 go, but it's not going to fetch me much money so that's up in the air.
This is a mess. Not what I wanted at all. Good problem to have, but still a problem.