Upload & Sell: On
Quite agree that no real benefit for you moving from the OM D to the D7k, in fact with it's full weather sealing, amazing stabilisation, size, the Oly would be my preference, but if I had your talent and your eye, the only way is up and the question you really have to ask, is my current gear holding me back?
D700 and more glass or D800 if you have to make the decision now or wait and see if the D600 covers your desires.
Bare in mind though, the top line pro cameras are "only" 16/18Mp and Bob Krist has no problem shooting for National Geographic with a D7k, and it was only in the last 18 months when he moved up from the D90
Looking forward to seeing you post here (FM) on a regular basis
It has been a pleasure