Clearly you have never ridden in Hokkaido and have absolutely no idea what kind of board works in the conditions there...
I have a question. Your list of mervin recommendations is (more or less) a list of boards from softest to stiffest. I've never ridden japan, so what makes the snow/terrain there especially suited to soft decks?
Up here in the PNW, especially on wet days, you really need some beef underfoot to handle the heavy stuff.