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Tim
You should see the ISO display in the VF at the bottom right - at least while you turn or adjust ISO or other exposure values. Obviously you can also display it on the rear LCD too with the info mode selected.
Btw, if you check option d3 and you should have the ISO value displayed instead of the exposure remaining count.
I know this sounds a bit looney, but pre-chill the camera (not the batteries) in a ziplock bag in your freezer. The colder the sensor, the lower the noise.
Just look at my aurora photo in the gallery and you'll see a 25 second exposure taken at -9 degrees F. Keep the batteries in your pocket until you need them.
http://www.getdpi.com/gallery/files/4/3/2a5w0815_fix.jpg
My Df live view is much lower noise when zoomed in than my D800. It's very good.
Have you tried with noise reduction set to on with the D800E? I do quite a bit of star stuff and if i'm not stacking then there's no problem with the second dark exposure, it actually does quite a good job. I've found with my Zeiss 21 that I can't do longer than 8 seconds without getting star movement, the second 8 second exposure is not a problem for me. The other way is obviously 2 exposures, 1 on the tracking mount for the stars and a second for the foreground at much lower ISO and blend them.
This might sound strange but I have a Sony RX1 which is unbelievable at night, I get cleaner files from that than the D800 but then it's restricted to the 35mm lens.
Have you got any images to show what you are doing?
Cheers
Mat