Jake, as you know I went from D600 to D800 recently. My main reasons were that I prefer the D800 body / functions and AF as its more like the D300s that I was used to.
In terms of the image quality the D600 was great and I'm not seeing a benefit there, but then again I don't do big prints. The ability to crop is impressive though, however you need a very good shot in the first place. I've had to tighten up my technique a lot to get images that are consistently good, whereas the D600 just took great images.
If you run in DX mode or simply crop an FX image ( it's effectively the same thing) you end up with an image just slightly smaller than the D7000.
The thing that would bother me if you're doing this a lot is the way DX mode works through the viewfinder, as it's the same as the D600. I'd end up missing things because I would be looking at the whole viewfinder rather than the box in the middle. I will probably not use DX mode on the D800 and just crop the FX images.
If you're going to spend money why not get the 24mp DX that's due out soon? That will give you more than the D800 for wildlife, be at least as functional as the D7000 and probably cost half as much.
In terms of the image quality the D600 was great and I'm not seeing a benefit there, but then again I don't do big prints. The ability to crop is impressive though, however you need a very good shot in the first place. I've had to tighten up my technique a lot to get images that are consistently good, whereas the D600 just took great images.
If you run in DX mode or simply crop an FX image ( it's effectively the same thing) you end up with an image just slightly smaller than the D7000.
The thing that would bother me if you're doing this a lot is the way DX mode works through the viewfinder, as it's the same as the D600. I'd end up missing things because I would be looking at the whole viewfinder rather than the box in the middle. I will probably not use DX mode on the D800 and just crop the FX images.
If you're going to spend money why not get the 24mp DX that's due out soon? That will give you more than the D800 for wildlife, be at least as functional as the D7000 and probably cost half as much.