Others to consider:
burton Sherlock - powder oriented twin, best in soft snow and powder, very surfy, really fun. Doesn't like ice much, and can be a bit squirrely in the flats on hardpack due to a pretty pronounced rocker in the middle.
burton juice wagon - cambered, tapered, with setback, handles less than ideal conditions well - designed for powder, I can't speak to that aspect yet, just got mine. Directional board, not great when ridden switch.
Might be hard to find what you are looking for - twin boards that are powder oriented tend to be rockered to at least some degree, which will be a detriment when conditions aren't ideal, while cambered boards for powder tend to be tapered and set back, and the camber handles the crud etc better. So you may have to choose between riding switch and handling marginal conditions.
Last edited by Lamps; 04-09-2014 at 10:28 AM.