the charlie fits that description well. stiff enough to be stable in big mountain situations and has a fat rockered tip to float. It just wasnt that much fun to ride. It didnt like to carve very well and sort of felt dead.
I havent rode the others, the summit looks sick, and i like the RC profile better than flat boards. I like my pow boards big and soft to give that surfy feel, while i like my big mountain boards closer to normal size and stiff for maneuverability and stability. I say get two boards.
A lib tech la nina, ride bezerker/highlife, jones flagship, neversummer raptor, or whatever burton is calling the supermodel now might fit the bill though. they wont be the pow destroyer that the charlie or summit will be, but they have a pow oriented shape in a big mountain package.