Hi Justin,
I'm just trying to keep things simple for you :)
I shoot at 320 ASA everything.. even at night. As far as Im concerned the chip is still 320, flick to RAW and the exposure stays the same.. so it must be. 320 sings for me...
However... I think it's best for (most) people that are not that good on the aperture to leave it at 800asa as a safe guard, you then have a stop up your sleeve if you bugger up.. Like a little insurance policy. Does not matter if your shooting RED, ARRI, FILM, anything.. never over expose. So leave it at 800asa, just for safety. It's a good place to stay.
I'm from a very high end photography back ground. I shot transparency for over a decade and had to keep my exposures within 1/4 of a stop. I've just taken this knowledge into my RED shooting and hence I very rarely over expose. I protect highlights like I protect my money in my pocket. :)..
Heres another crazy thing that I don't recomend... But I never look at the histograms, ever. I just shoot by eye. If it looks hot on the monitors or the EVF, then it is... I just simply roll back the aperture till it looks good.
