Niseko's next on my hit list. It's becoming a very popular spot, specially for us Aussies. Its relatively cheap and ur pretty much guaranteed deep powder. They say Niseko gets round 10-12m every season, i guess thats why they call it the powder capitol of the world. I think Habuka is another popular spot.
Ive heard u can get round these spots even if u dont speak the language as there is alot of tourists that comes thru each yr.
I'll be watching this thread as id like to hear from others who've experienced these slopes first hand.