I know this is an older post but if this can help you or someone . . . ..Of the three colors mentioned, Oyster White will give you the look you're after and will look good in bright light and in more dull blue light during winter also. It would look good with Iron Ore and with a more black paint from SW such as Black Magic or Tricorn Black. Alabaster on an exterior can look great but it's much brighter than Oyster White. Snowbound, while one of my personal faves, can have some funny pink undertones at times. As always, test test test! Natural lighting and reflections from trees/ water/ other houses will affect a paint's appearance.