You have a week to ride, and it's planned on your vacation, not the weather. I do the same thing, but do 2 trips for about 18 days. Same limits though, the weather is the weather. My point is that the odds of deep pow at a resort for a 6 day window are small, and even when it happens it's inches not feet.
I would pick a board accordingly. Getting a full on powder freeride deck would not be ideal. A powder/freeride oriented all mountain would be a better choice.
Based on what you say you want to ride, and because it matches what I look for almost exactly, I would recommend the cobra. Plenty stable at speed, quick edge to edge and turn initiation makes it great in trees, and it holds a line on hard pack/ice well. Middle of the road on stiffness, so it's not a stiff ass plank that takes a lot of work.