Scott, to follow your question of a body position that ranges from totally laid out to an angulated position...I think you can also think in terms of what you can get away with and what is the most efficient. And what you can get away with and what is most efficient will be affected by the texture of the snow (icy, hard pack or soft), the steepness of the hill, the speed of the rider, the lay of the land (fall away vs banked turn) and etc.
And most importantly all of this is determined by what puts the biggest smile on your face. :D:D:D