All Alabaster trim looks great with Alabaster walls, but potentially can become a real headache down the line if you are likely to fancy whiter, more neutral wall colours. For the trim then is more colourful, less neutral than the walls which may limit some choices.(not a problem if more neutral whites are unlikely)
FOR ceilings suggest either Alabaster or Delicate White or Extra White.
Delicate White or Extra White & Alabaster have enough difference in Chroma (colorfulness) that the walls would not appear dingy by comparison. Which option you choose depends upon how much contrast you enjoy between wall and trim. Even Alabaster will offer subtle contrast when painted in a different sheen on the trim, the other suggestions will show a stronger contrast and feel more crisp.
Ceilings painted the same colour as the walls can often look a little darker and more greyed by comparison. actual Ceiling paint can appear very stark in some lighting.
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