That's a vivid image.
I actually ski mostly in the West. I have only tried the B1 (not B2) in Alta and I thought the 170 was perfect; I would go for the B2 because of extra float in powder. My only other comparison for a mid-fat is the Ax3 which I felt was actually shortish at 170 (a bit wobbly when carving fast). But of course these are different skis.