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I'm a big fan of longer exposures. Stacking the shorter exposures tends to make for very white stars that in a long sequence can start to blow out the whole image.. and it becomes very difficult to see the bright stars/constellations as they get drowned out by faint ones.
Hot pixels are a bit of a pain but they subtract out very well with dark frames as they are true 'hot pixels' rather than random noise.
My base setting that I remember is 15 minutes, f4, ISO200. Easy to scale up or down from there in the same way that Greg describes. Haven't been doing much (any) photography since the eclipse, but finally have some new shots from the last week at Camp Cooinda on the Gippsland Lakes, including some star trails. Hope to post soon..
Phil
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