Ok so I have my worldcup irace skis which are less than 68mm wide as my only ski so far. I ski mainly here in colorado. Im thinking I may add a second ski. I am an intermediate and I am starting to progress more. I would like to get something better in the soft snow. I am a very big guy as I have stated before and I feel like i sink with by narrow skis (obviously considering my size). Im not too crazy about bumps but would like to venture in to some powder (not waist deep but like knee deep or below). Considering that I am 6'2 and 300 pounds, Do I need something very stiff?? I was looking at some skis like the watea 84, 94, monster 88, mojo 94, line prophet 90. Would any of this be good for me or am I looking at skis I shouldnt be looking at? Also I dont think the prophet 90 is wood core, does their material work against a guy my size?