Methinks you should change your name. When I read "silverwhale" I pictured this:
Not a 21 yo 120 lb girl... lol Hey are you going with Ryerson to Jay Peak? I grew up in Southern Ontario went with them a bunch of times it was good shit. That said, I also have a good idea of the crap you have to ride on most of the time.
For Ontario hardpack I felt a world of difference going to a stiffer, longer, cambered board. But Vermont and Utah should have some powder for you to play in...
One other board to consider:
Völkl International | Snowboards | *Yavana
It's available in a 146 but unfortunately I haven't found any reviews for it with just a quick search.
My last piece of advice is to not be scared to go a little longer. If you're freeriding almost all the time, you shouldn't notice any real negative effects to a longer board, but your high speed stability will really improve.