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Chris, I can't add much more than what Merlin's said, longer and more is the rule of thumb.
I'm a 5 min ISO800 sort of person, but then that's just me. One thing to remember though is that long subs will tend to wash out any star colour, so its a balancing act.
Some will swear at ISO 400 and it obviously works for them. Others ISO200. In the end its a personal choice. The lower the ISO the longer the exposure to get the same or similar result with high ISO. The trade off is more noise at higher ISO and to a certain degree (just my experience) lower native colour intensity/richness.
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