The three digit DSLR's are not all less well built than the pro level bodies. I shot a pair of D700's for years with MB-D10's attached and they were bullet proof. I finally broke one. Dropped just the body onto granite rocks from about 5' up. Viewing was screwed, but the camera continued to focus sharp and shoot for another 4 hours. Sent it to NPS and they turned it around in 4 days including replacing the shutter just as a precaution. D700 shutters were guaranteed for 150,000 actuations, but despite blowing way past that number, in 56 years behind a Nikon, I've never had a shutter problem. Besides, replacing it at Nikon is relatively cheap. $300, including the prism repair.
I've moved on to a pair of D4 and one D800 and the D4 shutter is guaranteed for 400,000 actuations. The camera is so fast it almost reads your mind. Buffering is also lightning fast, supporting more than100 frames at 11 fps. Rain is a non issue. So is temperature within what a human can tolerate. The 51 point focus points are not enough points. In studio, need to put the focus point in the eyes without having to reframe.
I'm really anxious to see what the D4s improves. If it's just video, I may pass. The current 4 does 1080p pretty well, but needs an external mike. I do not expect better low light. Now, iso of 12,800 is perfectly usable. One can always hope for more dynamic range, but the 4 is pretty good right now.
Anyway, that's my mind currently on Nikon. If someone wanted to be budget conscious and they are not concerned about video, I'd go for a used D700 for about $1,200-1,300. Same sensor as the D3 and tough as they come. With the D3 battery in the grip, it shoots 8-9fps.