I used to think metal equipment was more durable. This is becoming one heck of lot less true today. My D90 has taken hits that were awfully rough on me and the camera and lens survived very nicely. I have busted up two lens hoods. I have looked at D800s very closely. Having come from a large format background I am never convinced that bigger gear is better. In fact I have had guys who make their living selling cameras say that it totally depends on what the buyers use is of the camera. But used in the field, DX Nikons have clear advantages. The D800 and D4 owners I personally know say that they would rather have a D7000 for a travel camera. Since I travel to places to take photos as much as anything, I'd rather have DX. Are DX buyers MORE SENSITIVE TO PRICE? YES!!
I guess I am going to buy a D7200 or a D400 (if the price doesn't go stupid) when the NEXT one comes out. Again because cases and other tactics can greatly add to the weatherproofing of a camera I think the issue of the heavily sealed camera starts to get pretty sketchy. We own both UW and sports housings that will fit a D7000 although they were built for a D90. I would like Expeed 3 Processing. I sure as heck DO NOT want over 24MP. The D7200 is certainly going to be enough camera for my purchase. Right now I am almost just going to go buy yet ANOTHER D7000 NIKON. If Nikon does get with this D400 I sure would be surprised if I thought the price was very compelling.