You should look into a board in the 154-158 range, freestyle-freeride lengths. Any idea what you plan to be doing (park, all mountain?)
Good boards to look into:
Gnu CHB MTX
Good brands - Forum, Gnu, Lib Tech, Burton, Rome, Salomon, Ride...there are a lot of others as well.
And definately try your boots in store. I'd get your equipment now while its cheap; Sierrasnowboard has everything for at least half off.
Bindings: Burton Missions 07
Boots: Burton Freestyle 07