Upload & Sell: On
Virtually identical controls and menus, uses the same battery and grip. Easy to move back and forth depending on the situation.
Just added a D3s to the mix so we will see how that shakes out.
Yup, this is exactly the way that I went. I used the d300 and d700 side by side, for several years. To me, it was like having 2 complete sets of lenses to choose from. I could choose to have "overlapping" zooms, by putting the 70-200 on the d700 and the 28 or 24-70 on the d300. I could choose more or less DOF, without changing the aperture/exposure, on the same zooms, by putting the 28-70 on 1 body and the 24-70 on the other or the same with my fast primes.
Right now, the d3s is doing double duty. Sometimes it's an FX camera, others I will slap the 1.4x TC on it and make it a "DX" camera.
But, I only started doing this when the d700 became available. Prior to that, I had 2 identical bodies, starting with the d70. There are certainly benefits to having 2 identical bodies, but I prefer having FX and DX now, at least until the d300 is no longer useful.