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The alpha1s will dive pretty fast in anything deeper than a light dusting, they won't hold up to the amount of snow you'll be skiing when you go in jan/feb. I know if I was skiing in Japan I would take a pair of 120 waisted, moderate flexing, twin rockered pair skis with dukes/barons and a pair of 130+ waisted skis for the storm days. Check the blog quoted in my sig for powder ski reviews, if you have any questions regarding a review just pm me.
Joey
If you wan't a ski thast will handle over in Aus as well as Japan would look in 100-110 waist range. Personally I would lean more towards the 110 end as I prefer wider skis. Although a ski around the 100 mark would suffice I have ski my deepest days ever on a 100 waisted ski because that was all I had with me at the time. Considering the terrain/japan I would look for a twin rockered, moderately flexing etc. Skis you might wan't to consider are ON3P Jeffrey,Line SFB,Rossignol Sickle,Salomon Rocker2 108 (a rocker2 122 with a slimmed down waist). Ultimately you would be happier in Japan on the above skis however skis closer to 100 underfoot would offer greater versatility. If you are considering a waist around 100 you may want to look at Moment PB&J, Line Blend,ON3P Jeronimo
Screw it man, you're going there to ski pow, so get a pow ski. Something 115+ with loads of rocker. When I was out there my 2 friends on Obsetheds (the old 105mm waisted ones) both reckoned they would have liked a wider ski.
You could try and sell them while you're over there (skis go for huge money for some weird reason) or when you get back, if you find you don't like them. At the same time you might be pleasantly surprised by their performance on hardpack.