the thumb of rule is to use base ISO (100 in your case) as much as possible. Base ISO will give you the best image quality (largest dynamic range + lowest chromatic and luminous noise + largest tone range). I know a top professional photographer uses only base ISO on his Nikon D3X. That is a little hardcore.
That said, choice of shutter speed depends mainly on application. In many scenario (sport, kids, etc), you must use high speed in dim lighting condition, and then cranking up ISO is the only choice to make an ideal exposure. Canon 5D Mark II has excellent high ISO behavior.
That said, choice of shutter speed depends mainly on application. In many scenario (sport, kids, etc), you must use high speed in dim lighting condition, and then cranking up ISO is the only choice to make an ideal exposure. Canon 5D Mark II has excellent high ISO behavior.
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