This subject is more complex than temperature related. But iso800 is a good compromise in my experience.
Cameras have different properties. The 1000D is unique, besides being 12 bit, in that the sensor temperature flat lines once it is operating. The 40D is similar but slightly warmer. The 5D MKII is a hideous thermal monster and I prefer the older style 14bit camera. It would be interesting to make comparisons of newer camera models and sensor heating.
I sold my CLS-CCD filter because it was more trouble than it was worth. Unmodded cameras may benefit, but careful selection of iso and exposure times is just as effective, I think.
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