^ that sounds like a decent ski to start out with. on that particular ski i would say about 25-30 cm of rocker in both tip and tail. for what i like to do i would prefer the ski you just described and maybe two others. soft to medium stiffness in the nose, stiff underfoot, medium stiff on the tails.
the second would be like all mtn pow- freestyle . so dimensions like 135-118-133. something thats wide enough for the pow yet still can go all over. definately a 4000 series base, 35-40cm of rocker in the tip, and 30 35cm in the tail. maybe a 28 meter turn radius? medium flex in the nose, stiff underfoot, medium stiff tail. and design for the mounting point to be around -3 or so. -just some of my ideas
the third would be a powder ski. dimensions 150-127-145. maybe 50-60 cm of rocker in tip, 35cm in tail? medium flex in nose, stiff in waist, medium stiff in the tail for some stability on cliff drops. turn radius- 29meters. so a ski with quite a bit of rocker but still has some camber underfoot for stabilty on crud/packed snow. mounting point -5 or so?