Replying to Deciding between two skis

been deciding between the Line Prophet 90' 2012 or the Atomic Theory 2012,
going to be skiing mostly east coast, but maybe 1 or 2 trips out west. i'm 176cm and 150 pounds....what size should i get? i've been thinking 179cm model for the prophets and 177cm for the atomic theory.....is my theory correct? (pardon the pun). I have a racing background and ski anywhere on piste, i've never done pow, which is why these skis stood out. it seems to be very capable transition skis.
In sum i need a ski that can really do it all. 70/30 piste/off-piste, going to be on the groomers, in the back country and once in a while in the park hitting jumps and rails.

i'm sure both will be fine, but what do you guys think?