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A bias is a zero second dark, so by definition, it is already contained in every dark frame. I simply don't bother with bias frames.
There is also some non-linearity in SBIG dark frames, so best practice it to take a library of darks for a series of exposure times and temperatures, that will match your light frames.
Darks also change over time, so it is also good practice to grab a new set of dark frames every few months.
As for flats...I still find median combined sky flats to be the most accurate, but have recently installed a A1 sized EL sheet in my dome which I'm still coming to grips with...and will likely make a separate post on later.
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