Here's my suggestion to you....

Don't go to Neisko it will cost you too much for the internal flight.

Get a flight to Tokyo.
Stay here - it's right around the corner from all the snow shops in tokyo.
Get a 4 day flexible JR east rail pass -
Get on train to Hakuba
Stay here - ask to sleep in the dorm room, it will be cheaper (tell matt, craig and jen I say hai)