As the owner and still using the first D3 in private hands in the country (it was launched at Focus on the Satrday - mine was delivered to my house the previous Wednesday, along with the then new version 300 f2.8. I have used that camera solidly since then (4 years is it?) I have no idea how many shutter firings it has had (a lot) I can find out if someone tells me - it is perfect and it has had a hard life.
Things about the D3. I am happy to go with ONE charged battery for a week shooting features. I did 18 bike features and 2 fishing features last year on a week to Ireland. Something like 2000 pictures, on the one battery. That same battery still holds its charge - I don't have spare batteries, but I have got a second D3 which I bought maybe two years ago. When I did the Bering Sea/Bering Strait expedition this year I took both bodies, but there was nowhere to charge them and they came home still with about 1/2 charge left on each, so don't worry about battery life, provided you don't keep looking at the screen every five minutes or focussing the lenses from near to far every shot.
I have no reason to change the D3 for anything more modern. It is more camera than is needed for any editorial usage, and is more than adequate for most advertising these days. Built rugged to take the rough and tumble of a working life - mine spend much of their time afloat on the sea, the saltwater atmosphere hasn't affected them, the old one has been doused many times from sea water spray - a quick wash off with fresh water is all it has had and the flash contacts are still fine.
Get a D3 with confidence. The fact it doesn't have sensor shaking doesn't matter if you use good lens changing technique. ALWAYS turn the camera off before changing lenses. Turn your back to the wind and don't hang about with lens off the front. In a very dusty atmosphere I would stick with the two lenses, one on each and make do. OR have a bag or something to change lenses inside to keep the flying dust out. A blower will do the same job as a shaky sensor anyway - the dust might come off the sensor, but where does it go?
I am sticking with my pair of D3 bodies for the foreseeable future. They will last me another couple of years easily, by which time things will have moved on again!