Flights via Jetstar i would not pay over 600 bucks (thats cause i really don't like flying with them

)
also the notorious stop over in cairns/sunshine coast is a drain and complete waste of time
i think their specials normally go for about 800 (but this is with buy 1 get 1 free type deals)
anything near 1k is bullshit for utter Jetstar
everyone else about 1200 is a good price
prefer going with JAL or Qantas as they do non-stop flights in
Luggage you will need to look into at time of booking
cause they change in year to year (AIR NZ did a major change last year with sports gear)
Hakuba can be reached by either Tokyo (Haneda) or Osaka (kansai) airports but i prefer going via Tokyo
easier to setup a 2 day after boarding into Tokyo if your flying out of there
unsure how long you are going for
Snow monkeys isnt too bad but you are right it does cut into snowboarding time
pretty much a full day trip
i prefer DIY myself because i like to control exactly where my money/time goes. If you feel its too much hassle etc and aren't picky then agents definitely go thru agent
At least get quotes etc if your unsure from them cause they do provide added benefits and you can budget to see how much "cut" they making
ill post more later after lunch =)