Phil,
As a general rule, the bigger the sensor, or the less densely packed with pixels it is, the better the low light performance. So, if you're not going for a dSLR, then a "compact" with a bigger sensor will probably perform better in low light.
I don't know what your budget is, but take a look at the Olympus PL1 or Panasonic GF1. If you want some enormous zoom range and don't want the faff of changing lenses, then you are after the holy grail and it doesn't exist. Yet.
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