Upload & Sell: On
So, it sounds like I can go with pretty much any Nikon body and be ok. I guess I'll just wait a bit and see if the D600 materializes and make my decision then.
I would disagree with that and agree with the other posters that talk about long lenses on a DX camera. IME, for stationary surveillance, you can't have too long of a zoom lens or too high an ISO. ATM, the best DX camera for that, is the d7000. Unfortunately, Nikon doesn't have a really good long zoom for surveillance, IMO. Maybe the Sigma 50-500 would work, but that's a huge lens and I don't know how well it would work on a d7k in low light.
The best surveillance cameras that I used, weren't dslr's, they were high end, interchangeable lens, video cameras with a night scope lens, for long range surveillance and a briefcase or body camera with button lens, for the close stuff. I used my own dslrs and lenses as well, but the video cameras were much easier to use in getting the job done. The dslrs were mainly used for forensic purposes, but a small digicam accomplished the same goal, plus had the audio available for any commentary.
If I were doing that stuff today, I'd be looking at a top end prosumer or pro video camera first, to see what low light stuff and lenses are available. I believe it's much easier to mount video cams in a vehicle too, depending on what you need to do. Flip out screens on any of the video cams are much easier to use, while remaining stealthy, than using a dslr viewfinder and only the largest video cameras would come close to the physical size of a dslr with a big telephoto stuck on it.
Lastly, if you need to use the stuff for court, video tapes are acceptable in every court in the US. Last I knew, that wasn't true for still images.
Food for thought